Bisphenol ester derivatives

ABSTRACT

Stabilisers of formula I    &lt;IMAGE&gt;  (I)  wherein R1 and R2 may be C1-C5alkyl, the substituents R3 to R8 may be hydrogen, the variable n may be 1 or 2, and, when n is 1, A may be an alkoxy radical, and, when n is 2, A may be a diamine radical.

The present invention relates to novel bisphenol derivatives, to the use thereof and to the organic material stabilised therewith against oxidative, thermal and light-induced degradation.

The use of some bisphenol ester derivatives as stabilisers is disclosed, inter alia, in JP-A-Hei 4-308 581, DE-A-3 718 751, EP-A-479 550 and U.S. Pat. No. 4,414,408.

In one of its aspects, the invention relates to compounds of formula I ##STR2## wherein the substituents R₁ are each independently of one another C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,

the substituents R₂ are each independently of one another hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃,

the substituents R₃ are each independently of one another hydrogen or C₁ -C₄ alkyl,

R₄ is hydrogen or C₁ -C₈ alkyl,

R₅ is hydrogen, C₁ -C₁₀ alkyl, phenyl, --CH₂ --COO--X₄ or CN,

R₆ is hydrogen, C₁ -C₄ alkyl, phenyl, --COO--X₅, --CN or --CON(X₆)(X₇),

R₇ is hydrogen or C₁ -C₁₀ alkyl,

R₈ is hydrogen, C₁ -C₄ alkyl or phenyl,

X₁ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁,

X₂, X₄ and X₅ are each independently of one another C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

X₃ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₂₅ alkanoyl, C₃ -C₂₅ alkenoyl, C₃ -C₂₅ alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl or furoyl,

X₆ and X₇ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

Y₁ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

Y₂ is hydrogen or C₁ -C₈ alkyl,

p is 0, 1 or 2,

q is an integer from 0 to 8,

r is 1 or 2,

n is an integer from 1 to 4, and,

when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom,

Z₁ is hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₅ alkyl which is interrupted by oxygen, sulfur or >N--Y₂, C₃ -C₂₄ alkenyl, a monocyclic saturated hydrocarbon radical containing 5 to 20 carbon atoms, a bicyclic saturated hydrocarbon radical containing 7 to 20 carbon atoms, a tricyclic saturated hydrocarbon radical containing 10 to 20 carbon atoms, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, C₇ -C₉ phenylalkyl, C₇ -C₉ phenylalkyl which is substituted at the phenyl ring by C₁ -C₄ alkyl; tetrahydrofurfuryl, tetrahydroabietyl, C₁ -C₂₅ alkanoyl, C₃ -C₂₅ alkenoyl, C₃ -C₂₅ alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl or a group of formula IIa or IIb, ##STR3## Z₂ is hydrogen, C₁ -C₂₅ alkyl, OH-substituted C₂ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₂₅ alkanoyl, C₃ -C₂₅ alkenoyl, C₃ -C₂₅ alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb,

Z₃ is hydrogen, C₁ -C₂₅ alkyl, OH-substituted C₂ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, or

Z₂ and Z₃, taken together, are C₃ -C₆ alkylene, C₃ -C₆ xoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen, sulfur or >N--T₆,

Z₄ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

Z₅ and Z₆ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, or

Z₅ and Z₆, together with the linking carbon atom, form an unsubstituted or a C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkylidene ring,

Z₇ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁,

Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl,

T₁ and T₂ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,

T₃ is hydrogen or C₁ -C₄ alkyl,

T₄ is hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃,

T₅ is hydrogen, C₁ -C₈ alkyl, --OH-substituted C₂ -C₄ alkyl, O, --OH, --NO, --CH₂ CN, C₁ -C₁₈ alkoxy, C₅ -C₁₂ cycloalkoxy, C₃ -C₆ alkenyl, C₇ -C₉ phenylalkyl, C₇ -C₉ phenylalkyl which is substituted at the phenyl ring by C₁ -C₄ alkyl; C₁ -C₈ alkanoyl, C₃ -C₈ alkenoyl or benzoyl,

T₆ is C₁ -C₁₂ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl,

C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

m is 1 or 2,

w is 0 or 1,

when n is 2, A is a group of formula IIIa, IIIb, IIIc, IIId, IIIe or IIIf, ##STR4## G₁ and G₃ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb,

G₂ is C₂ -C₁₂ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene, naphthylene, C₂ -C₂₀ alkanedioyl, C₄ -C₂₀ alkenedioyl or carboxybenzoyl,

G₄ and G₆ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

G₅ is C₂ -C₁₂ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene,

G₇ is C₂ -C₂₀ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene ), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, C₂ -C₂₀ alkanedioyl, C₄ -C₂₀ alkenedioyl, carboxybenzoyl or a group of formula IVa, IVb or IVc ##STR5## G₈ and G₁₀ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

G₉ and G₁₁ are C₂ -C₁₂ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene,

G₁₂ is hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

the substituents D₁ are each independently of the other hydrogen, C₁ -C₈ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

the substituents D₂ are each independently of the other hydrogen, C₁ -C₈ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

D₃ and D₄ are each independently of the other hydrogen, CF₃, C₁ -C₁₂ alkyl or phenyl, or

D₃ and D₄, together with the linking carbon atom, form an unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkylidene ring,

t is 1 or 2,

v is 0 or 1,

when n is 3, A is a group of formula Va, Vb or Vc, ##STR6## E₁ is C₃ -C₇ alkanetriyl, E₂ and E₃ are C₂ -C₈ alkylene,

when n is 4, A is a group of formula VI ##STR7## and E₄ is C₄ -C₁₀ alkanetetrayl or C₄ -C₁₀ alkanetetrayl which is interrupted by oxygen.

Alkyl containing up to 25, preferably up to 18 and most preferably up to 10, carbon atoms, is typically methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2-ethylbutyl, n-pentyl, tert-pentyl, isopentyl, 1-methylpentyl, 1,3-dimethylbutyl, n-hexyl, 1-methylhexyl, n-heptyl, isoheptyl, 1,1,3,3-tetramethylbutyl, 1-methylheptyl, 3-methyl-heptyl, n-octyl, 2-ethylhexyl, 1,1,3-trimethylhexyl, 1,1,3,3-tetramethylpentyl, nonyl, decyl, undecyl, 1-methylundecyl, dodecyl, 1,1,3,3,5,5-hexamethylhexyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, eicosyl or docosyl.

One of the preferred meanings of R₁ and R₂ is branched C₁ -C₁₀ alkyl, more particularly C₁ -C₅ alkyl, typically methyl, tert-butyl and tert-pentyl.

One of the preferred meanings of R₄ is C₁ -C₄ alkyl, more particularly methyl.

One of the preferred meanings of Y₂ is C₁ -C₄ alkyl, more particularly methyl.

One of the preferred meanings of Z₁ and Z₂ is C₁ -C₁₈ alkyl.

One of the preferred meanings of Z₇ is C₁ -C₁₈ alkyl, more particularly C₁ -C₁₀ alkyl.

One of the preferred meanings of T₁, T₂ and T₄ is C₁ -C₄ alkyl, more particularly methyl and tert-butyl.

One of the preferred meanings of T₅ is C₁ -C₄ alkyl, more particularly methyl.

One of the preferred meanings of T₆ is C₁ -C₄ alkyl.

Illustrative examples of C₃ -C₂₅ alkyl which is interrupted by oxygen, sulfur or >N--Y₂ are CH₃ --O--CH₂ CH₂ --, CH₃ --CH₂ --O--CH₂ --CH₂ --CH₂ --O--, (CH₃)₂ CH--O--CH₂ --CH₂ --, CH₃ --S--CH₂ CH₂ --, CH₃ --NH--CH₂ CH₂ --, CH₃ --N(CH₃)--CH₂ CH₂ --, CH₃ --O--CH₂ CH₂ --O--CH₂ CH₂ --, CH₃ --(O--CH₂ CH₂ --)₂ O--CH₂ CH₂ --, CH₃ --(O--CH₂ CH₂ --)₃ O--CH₂ CH₂ -- and CH₃ --(O--CH₂ CH₂ --)₄ O--CH₂ CH₂ --. C₃ -C₂₅ Alkyl which is interrupted by oxygen or >N-Y₂ is preferred, and C₃ -C₁₀ alkyl which is interrupted by oxygen is more preferred. The radicals (C₁ -C₅ alkyl)--(OCH₂ CH₂)₁₋₁₀ -- and (C₁ -C₅ alkyl)--(OCH₂ CH₂)₁₋₂ -- are particularly preferred.

--OH-substituted C₂ -C₂₅ alkyl, in particular --OH-substituted C₂ -C₄ alkyl, may typically be 2-hydroxyethyl, 2-hydroxypropyl, 2-hydroxybutyl or 4-hydroxybutyl.

C₁ -C₁₈ Alkoxy is typically methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentyloxy, isopentyloxy, hexyloxy, heptyloxy, octyloxy, decyloxy, dodecyloxy, tetradecyloxy, hexadecyloxy and octadecyloxy. C₆ -C₁₂ Alkoxy, in particular heptyloxy and octyloxy, is preferred.

Alkenyl containing up to 24, preferably up to 18, carbon atoms, is typically vinyl, propenyl, isopropenyl, 2-butenyl, 3-butenyl, isobutenyl, 3-methyl-but-2-enyl, n-oct-2-enyl, n-dodec-2-enyl, isododecenyl, n-octadec-2-enyl or n-octadec-4-enyl. Alkenyl radicals in which the carbon atom in 1-position is saturated are preferred. C₃ -C₁₈ Alkenyl is particularly preferred.

Unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl is typically cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, 2- or 4-methylcyclohexyl, dimethylcyclohexyl, trimethylcyclohexyl or tert-butylcyclohexyl. Unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₈ -cycloalkyl, more particularly cyclohexyl, is preferred.

One of the preferred meanings of R₁ is cyclohexyl.

Illustrative examples of C₅ -C₁₂ cycloalkoxy are cyclopentyloxy, cyclohexyloxy, cycloheptyloxy, cyclooctyloxy, cyclodecyloxy and cyclododecyloxy. Cyclopentyloxy and cyclohexyloxy are preferred.

A monocyclic saturated hydrocarbon radical containing 5 to 20 carbon atoms is typically unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl or (C₅ -C₁₂ cycloalkyl)--(C₁ -C₄ alkyl) which is unsubstituted or substituted in the cycloalkyl moiety by C₁ -C₄ alkyl, typically cyclohexylmethyl, methylcyclohexylmethyl or dimethylcyclohexylmethyl.

A bicyclic saturated hydrocarbon radical containing 7 to 20 carbon atoms is typically ##STR8##

A tricyclic saturated hydrocarbon radical containing 10 to 20 carbon atoms is typically ##STR9##

Typical examples of unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, preferably C₅ -C₈ cycloalkenyl, are cyclohex-2-enyl, cyclohept-3-enyl and 4-tert-butylcyclohex-2-enyl. Cyclohexenyl is preferred.

C₁ -C₄ Alkyl-substituted phenyl is typically methylphenyl, dimethylphenyl, trimethylphenyl, ethylphenyl, diethylphenyl, isopropylphenyl, tert-butylphenyl, di-tert-butylphenyl or methyl-di-t-butylphenyl.

Illustrative examples of an unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkylidene ring are ##STR10##

A C₅₋ C₈ cycloalkylidene ring is preferred.

Illustrative examples of C₇ -C₉ phenylalkyl which may be unsubstituted or substituted at the phenyl ring by C₁ -C₄ alkyl are benzyl, phenethyl, 3-phenylpropyl, α-methylbenzyl, α,α-dimethylbenzyl, methylbenzyl, dimethylbenzyl, trimethylbenzyl and tert-butylbenzyl.

Alkanoyl containing up to 25 carbon atoms may be methanoyl, ethanoyl, propanoyl, butanoyl, pentanoyl, hexanoyl, heptanoyl, octanoyl, nonanoyl, decanoyl, undecanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, pentadecanoyl, hexadecanoyl, octadecanoyl, nonadecanoyl or eicosanoyl. C₁ -C₁₈ Alkanoyl is a preferred meaning.

C₃ -C₂₅ Alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂ will typically be --CO--CH₂ CH₂ --S--(C₁ -C₁₀ alkyl), --CO--CH₂ CH₂ --O--(C₁ -C₁₀ alkyl) and --CO--CH₂ CH₂ --N(Y₂)--(C₁ -C₁₀ alkyl). C₃ -C₂₅ Alkanoyl which is interrupted by oxygen or >N--Y₂ is preferred.

C₃ -C₂₅ Alkenoyl is typically acryloyl, methacryloyl, crotonoyl, isocrotonoyl and oleolyl. C₃ -C₁₈ Alkenoyl is preferred.

C₆ -C₉ Cycloalkylcarbonyl is typically cyclopentylcarbonyl, cyclohexylcarbonyl, cycloheptylcarbonyl or cyclooctylcarbonyl.

C₁ -C₄ Alkyl-substituted benzoyl is typically methylbenzoyl or tert-butylbenzoyl.

Illustrative examples of an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valency at a nitrogen atom are: ##STR11##

A 5-7-membered heteromonocyclic radical and a 9-10-membered heterobicyclic radical is preferred. The particularly preferred hetero atom is nitrogen. Also preferred are: unsubstituted or C₁ -C₄ alkyl-substituted 1-pyrrolyl, unsubstituted or C₁ -C₄ alkyl-substituted 1-pyrazolyl, unsubstituted or C₁ -C₄ alkyl-substituted 1-imidazolyl, 1-triazolyl, unsubstituted or C₁ -C₄ alkyl-substituted 1-benzimidazolyl or 1-benzotriazolyl.

Z₈ is typically a group ##STR12##

Alkylene containing up to 20, preferably up to 12 or up to 6, carbon atoms, is typically ethylene, propylene, trimethylene, tetramethylene, pentamethylene, 2,2-dimethyltrimethylene, hexamethylene, trimethylhexamethylene, octamethylene, decamethylene, undecamethylene or dodecamethylene.

One of the preferred meanings of G₂, G₅, G₇, G₉ and G₁₁ is C₂ -C₈ alkylene.

C₄ -C₂₀ Alkylene which is interrupted by oxygen, sulfur or >N--Y₂ is typically --CH₂ CH₂ --O--CH₂ CH₂ --, --CH₂ CH₂ --S--CH₂ CH₂ --, --CH₂ CH₂ --NH--CH₂ CH₂ --, --CH₂ CH₂ CH₂ --NH--CH₂ CH₂ CH₂ --, --CH₂ CH₂ CH₂ --NH--CH₂ CH₂ --, --CH₂ CH₂ CH₂ CH₂ --NH--CH₂ CH₂ CH₂ --, --(CH₂)₆ --NH--(CH₂)₆ --, --CH₂ CH₂ --N(CH₃)--CH₂ CH₂ --, --CH₂ CH₂ CH₂ --N(CH₃)--CH₂ CH₂ CH₂ --, --CH₂ CH₂ --(O--CH₂ CH₂ --)₂ O--CH₂ CH₂ --, --CH₂ CH₂ --(O--CH₂ CH₂ --)₃ O--CH₂ CH₂ --, --CH₂ CH₂ --(O--CH₂ CH₂ --)₄ O--CH₂ CH₂ --, --CH₂ CH₂ CH₂ CH₂ --O--CH₂ CH₂ CH₂ CH₂ --O --CH₂ CH₂ CH₂ CH₂ --, --CH₂ CH₂ --NH--CH₂ CH₂ --NH--CH₂ CH₂ --, --CH₂ CH₂ CH₂ --NH--CH₂ CH₂ --NH--CH₂ CH₂ CH₂ -- or --CH₂ CH₂ CH₂ --NH--CH₂ CH₂ CH₂ CH₂ --NH--CH₂ CH₂ CH₂ --. C₄ -C₂₀ Alkylene which is interrupted by oxygen or >N--Y₂ is preferred. The radicals --CH₂ CH₂ --O--CH₂ CH₂ -- and --CH₂ CH₂ CH₂ CH₂ --O--CH₂ CH₂ CH₂ CH₂ --O--CH₂ CH₂ CH₂ CH₂ -- are particularly preferred.

A preferred meaning of --N(Z₂)(Z₃) is morpholino.

C₃ -C₆ Alkylene which is interrupted by >N--T₆ is typically --CH₂ CH₂ --N(CH₃)--CH₂ CH₂ --, --CH₂ CH₂ CH₂ --N(CH₃)--CH₂ CH₂ CH₂ --.

C₃ -C₆ Oxoalkylene is typically --CO--CH₂ CH₂ CH₂ CH₂ --.

C₄ -C₂₀ Alkenylene is typically 2-but-1,4-enylene, 3-pent-1,5-enylene or 2-hex- 1,6-enylene.

C₄ -C₂₀ Alkynylene is typically 2-butynylene (--CH₂ --C═C--CH₂ --), 2-pentynylene, 2-hexynylene, 3-hexynylene, 3-heptynylene, 2-decynylene, 4-decynylene or 8-octadecynylene.

(C₁ -C₄ Alkylene)phenylene-(C₁ -C₄ alkylene) is typically a group ##STR13##

Illustrative examples of a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms are a group ##STR14## and C₅ -C₁₂ cycloalkylene such as cyclopentylene, cyclohexylene, cycloheptylene or cyclooctylene.

Illustrative examples of a bicyclic saturated hydrocarbon radical having two free valences and 7 to 30 carbon atoms are ##STR15##

C₁ -C₄ Alkyl-substituted phenylene is typically methylphenylene or tert-butylphenylene.

C₂ -C₂₀ Alkanedioyl is typically ethanedioyl, propanedioyl, butanedioyl, pentanedioyl, hexanedioyl, heptanedioyl, octanedioyl, nonanedioyl or decanedioyl. C₂ -C₁₀ Alkanedioyl is preferred.

C₄ -C₂₀ Alkenedioyl is typically maleoyl, fumaroyl, citraconoyl or mesaconoyl.

Illustrative examples of C₃ -C₇ alkanetriyl are ##STR16##

Illustrative examples of C₄ -C₁₀ alkanetetrayl or C₄ -C₁₀ alkanetetrayl which is interrupted by oxygen are ##STR17##

R₅, R₆, R₇ and R₈ are preferably hydrogen.

The variable n is preferably 1 or 2.

Preferred compounds of formula I are those, wherein

the substituents R₁ are each independently of one another C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,

the substituents R₂ are each independently of one another hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃,

the substituents R₃ are each independently of one another hydrogen or C₁ -C₄ alkyl,

R₄ is hydrogen or C₁ -C₈ alkyl,

R₅ is hydrogen, C₁ -C₁₀ alkyl or phenyl,

R₆ is hydrogen, C₁ -C₄ alkyl or phenyl,

R₇ is hydrogen or C₁ -C₁₀ alkyl,

R₈ is hydrogen, C₁ -C₄ alkyl or phenyl,

X₁ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁,

X₂ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

X₃ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₈ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl or furoyl,

Y₁ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

Y₂ is hydrogen or C₁ -C₈ alkyl,

p is 0, 1 or 2,

q is an integer from 0 to 8,

r is 1 or 2,

n is an integer from 1 to 4, and,

when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom,

Z₁ is hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkyl which is interrupted by oxygen or >N--Y₂, C₃ -C₁₈ alkenyl, C₅ -C₁₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, C₇ -C₉ phenylalkyl, C₇ -C₉ phenylalkyl which is substituted at the phenyl ring by C₁ -C₄ alkyl; tetrahydrofurfuryl, tetrahydroabietyl, C₁ -C₁₈ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen or >N--Y₂, C₆ -C₉ -cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl or a group of formula IIa or IIb,

Z₂ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₈ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb,

Z₃ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, or

Z₂ and Z₃, taken together, are C₃ -C₆ alkylene, C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen or >N--T₆,

Z₄ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted penyl or C₇ -C₉ phenylalkyl,

Z₅ and Z₆ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, or

Z₅ and Z₆, together with the linking carbon atom, form an unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkylidene ring,

Z₇ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁,

Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl,

T₁ and T₂ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,

T₃ is hydrogen or C₁ -C₄ alkyl,

T₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃,

T₅ is hydrogen, C₁ -C₄ alkyl, --OH, C₆ -C₁₂ alkoxy, C₅ -C₈ cycloalkoxy, allyl, benzyl or acetyl,

T₆ is C₁ -C₁₂ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl,

m is 1 or 2,

w is 0 or 1,

when n is 2, A is a group of formula IIIa, IIIb, IIIc, Illd, IIIe or IIIf,

G₁ and G₃ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb,

G₂ is C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, C₂ -C₁₈ alkanedioyl, C₄ -C₁₈ alkenedioyl or carboxybenzoyl,

G₄ and G₆ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

G₅ C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene,

G₇ is C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, C₂ -C₁₈ alkanedioyl, C₄ -C₁₈ alkenedioyl or carboxybenzoyl

G₈ and G₁₀ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

G₉ and G₁₁ are C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene,

G₁₂ is hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C5-C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, and

t is 1 or2.

Likewise preferred are compounds of formula I, wherein

the substituents R₁ are each independently of one another C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₅ -C₈ -cycloalkcnyl, phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,

the substituents R₂ are each independently of one another hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃,

the substituents R₃ are hydrogen,

R₄ is hydrogen or C₁ -C₄ alkyl,

R₅ is hydrogen, C₁ -C₄ alkyl or phenyl,

R₆ is hydrogen, C₁ -C₄ alkyl or phenyl,

R₇ is hydrogen or C₁ -C₄ alkyl,

R₈ is hydrogen, C₁ -C₄ alkyl or phenyl,

X₁ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁,

X₂ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl or C₇ -C₉ phenylalkyl,

X₃ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₀ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen; or benzoyl,

Y₁ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl or C₇ -C₉ phenylalkyl,

p is 0, 1 or 2,

q is an integer from 0 to 8,

r is 1 or 2,

n is an integer from 1 to 4, and,

when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom,

Z₁ is hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkyl which is interrupted by oxygen; C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₇ -C₉ phenylalkyl, tetrahydrofurfuryl, C₁ -C₁₀ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen; benzoyl or a group of formula IIa or IIb,

Z₂ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₀ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen; benzoyl, --(CH₂)_(p) COO--X₂ or a group of formula IIb,

Z₃ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₀ alkyl, C₃ -C₁₈ alkenyl,

C₅ -C₈ -cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, or

Z₂ and Z₃, taken together, are C₃ -C₆ alkylene, C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen,

Z₄ is C₁ -C₁₀ alkyl, C₅ -C₈ -cycloalkyl, phenyl or C₇ -C₉ phenylalkyl,

Z₅ and Z₆ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, phenyl or C₇ -C₉ phenylalkyl, or

Z₅ and Z₆, together with the linking carbon atom, form a C₅ -C₈ cycloalkylidene ring,

Z₇ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO-Y₁,

Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl,

T₁ and T₂ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₅ -C₈ cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,

T₃ is hydrogen or C₁ -C₄ alkyl,

T₄ is hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ -cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃,

T₅ is hydrogen, C₁ -C₄ alkyl, --OH, C₆ -C₁₂ alkoxy, C₅ -C₈ cycloalkoxy, allyl, benzyl or acetyl,

m is 1 or 2,

w is 0 or 1,

when n is 2, A is a group of formula IIIa, IIIb, IIIc, IIId, IIIe or IIIf,

G₁ and G₃ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb,

G₂ is C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms, phenylene, C₂ -C₁₀ alkanedioyl, C₄ -C₁₀ alkenedioyl or carboxybenzoyl,

G₄ and G₆ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

G₅ is C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms or phenylene,

G₇ is C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms, phenylene, C₂ -C₁₀ alkanedioyl, C₄ -C₁₀ alkenedioyl or carboxybenzoyl,

G₈ and G₁₀ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb,

G₉ and G₁₁ are C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms or phenylene,

G₁₂ is hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, and

t is 1 or 2.

Compounds of formula I are also preferred, wherein

n is 1,

A is a group of formula --N(Z₂)(Z₃),

Z₂ is hydrogen, and

Z₃ is hydrogen, C₁ -C₂₅ alkyl, OH-substituted C₂ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb.

Other preferred compounds of formula I are those wherein

n is 1,

A is a group of formula --O--Z₁, and

Z₁ is C₁ -C₂₅ alkyl which is interrupted by oxygen; or a group of formula IIa, and

w is 1.

A further preferred embodiment of the invention comprises compounds of formula I, wherein

the substituents R₁ are identical and are C₁ -C₅ alkyl or C₅ -C₈ cycloalkyl,

the substituents R₂ are identical and are C₁ -C₅ alkyl,

the substituents R₃ are hydrogen, and

R₄ is hydrogen or C₁ -C₄ alkyl.

Particularly preferred compounds of formula I are those, wherein

the substituents R₁ are identical and are C₁ -C₅ alkyl or C₅ -C₈ cycloalkyl,

the substituents R₂ are identical and are C₁ -C₅ alkyl,

the substituents R₃ are hydrogen,

R₄ is hydrogen or C₁ -C₄ alkyl,

R₅, R₆, R₇ and R₈ are hydrogen,

n is 1 or 2, and,

when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom,

Z₁ is C₁ -C₁₈ alkyl, C₃ -C₁₀ alkyl which is interrupted by oxygen; C₅ -C₈ cycloalkyl, tetrahydrofurfuryl or a group of formula IIa or IIb,

Z₂ is C₁ -C₁₈ alkyl, --OH-substituted C₂ -C₄ alkyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb,

Z₃ is hydrogen, C₁ -C₁₈ alkyl, --OH-substituted C₂ -C₄ alkyl, C₇ -C₉ phenylalkyl or a radical of formula IIb, or

Z₂ and Z₃, taken together, are C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen,

Z₄ is C₇ -C₉ phenylalkyl,

Z₅ and Z₆, together with the linking carbon atom, form a C₅ -C₈ cycloalkylidene ring,

Z₇ is C₁ -C₁₀ alkyl,

Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl,

T₁, T₂, T₃ and T₄ are each independently of the other hydrogen or C₁ -C₄ alkyl,

T₅ is hydrogen or C₁ -C₄ alkyl,

X₂ is C₁ -C₁₀ alkyl,

m is 1 or 2,

p is 1,

w is 0 or 1, and

when n is 2, A is a group of formula IIIa, IIIc or IIIf,

G₁ and G₃ are each independently of the other hydrogen, C₇ -C₉ phenylalkyl or a radical of formula IIb,

G₂ is C₂ -C₈ alkylene or a monocyclic saturated hydrocarbon radical with two free valences and containing 10 carbon atoms,

G₇ is C₂ -C₈ alkylene or C₄ -C₁₂ alkylene which is interrupted by oxygen, and

G₁₂ is C₇ -C₉ phenylalkyl or a group of formula IIb.

The compounds of formula I may be prepared by the following per se known processes:

Process A:

Reaction of a compound of formula a ##STR18## with a suitable compound of formula b (Michael addition), ##STR19## in which formulae above R₁ to R₈ and A as well as the index n are as defined for formula I.

The reaction can be carried out by mixing the two reactants, with or without a solvent. Suitable solvents are customary hydrocarbons (e.g. toluene, hexane and cyclohexane), halogenated hydrocarbons (e.g. dichloromethane, dichloroethane and chlorobenzene), ethers (e.g. diethyl ether, dibutyl ether, tetrahydrofuran find dimethoxyethane), alcohols e.g. methanol and ethanol) and also acetonitrile, butyl acetate and dimethyl formamide.

The reaction is preferably carried out in the temperature range from 5° C. to the boiling point of the reaction mixture.

When adding an alcohol (or a mercaptan) to the compound of formula a it is preferred to add catalytic amounts of a base (0.5-30 mol %) to the reaction mixture. Suitable bases typically include alkali metal hydroxides, C₁ -C₅ alkali metal alkoxides, amines (e.g. triethylamine, N,N-dimethylaniline, N-methylaniline and pyridine), tetraalkylammonium hydroxides or benzyltrimethylammonium hydroxide or also organometallic compounds (e.g. BuLi).

Compounds of formula I, wherein A is a group --S(O)_(m) Z₇, may be obtained by reacting a bisphenol monoacrylate of formula a with a mercaptan of formula b (A═SZ₇) and subsequently oxidising the resultant thioether by standard methods (q.v. inter alia Comprehensive Organic Chemistry, Vol 3, p. 124-126, 174, Ed. D. Neville Jones, Pergamon Press, 1979).

Process B:

Esterification or transesterification of organic carboxylic acid derivatives of formula c ##STR20## with bisphenols of formula d, ##STR21## in which formulae above R₁ to R₈ and A as well as the index n are as defined for formula I ##STR22##

The reaction can be carried out in per se known manner, conveniently by adding one of the two educts to the second educt and thoroughly mixing both reactants, preferably excluding oxygen. The reaction can be carried out with or without a solvent (e.g. toluene). The temperature may be in the range from the melting point to the boiling point of the reaction mixture, suitably in the range from -50° to 150° C., preferably from 0° to 150° C. The purification of the resultant product can likewise be effected by known methods, typically by washing with water/HCl, extraction with an organic solvent, crystallisation and/or chromatography. Preferred solvents for the extraction and for the chromatographic purification step are hexane, ethyl acetate or mixtures thereof.

If an acid chloride (X═Cl) is used in the reaction as derivative of the carboxylic acid of formula c, then an acid acceptor can also be added to the reaction mixture. Suitable acid acceptors are typically amines such as pyridine or triethylamine. The amount of acid acceptor is preferably at least equivalent to the amount of acid chloride and is typically 1 to 2 equivalents, preferably 1.2 to 1.7 equivalents, based on the acid chloride.

The acid chloride can also be prepared "in situ", in which case the carboxylic acid of formula c (X═OH), the bisphenol of formula d and an acid acceptor (e.g. triethylamine) are charged to the reactor and then the phosphoroxy chloride is added in analogy to the process described in U.S. Pat. No. 5,128,398.

If the carboxylic acid of formula c and the bisphenol of formula d are used direct as educts, then the reaction is conveniently carried out using a reagent that absorbs water of reaction, typically dicyclohexylcarbodiimide.

Process C:

Reaction of a chloride of formula e ##STR23## with a compound of formula b, preferably in the presence of a base as acid acceptor. Suitable acid acceptors are amines (such as triethylamine and pyridine), hydrides (such as lithium, sodium and potassium hydride), alcoholates (such as sodium methanolate and potassium tert-butylate) and organometallic bases (such as BuLi).

If the base is a hydride, an alkali metal, alkali metal hydroxide, alkali metal alcoholate or alkyl lithium compound, then the corresponding anion of the compound of formula b can be formed first.

Illustrative examples of compounds of formula I are listed in the following Table 1.

    TABLE 1       -   Elemental analysis         Mass spectrum       Compound Structure Melting point       101       ##STR24##       Elemental analysiscalcd:found:Melting point124-126° C. C      %79.0079.03 H %8.648.61 N %2.792.74      102       ##STR25##       Elemental analysis:calcd:found:Mass spectrum:(CI): 592(MH.sup.+) C      %81.1880.34 H %8.358.59 N %2.372.85      103       ##STR26##       Mass spectrum(DEI): 620(M.sup.+)Melting point38-43°       C.                                                                 104       ##STR27##       Elemental analysiscalcd:found: C %79.0178.57 H %11,1811,36 N %3,613,37      105       ##STR28##       Elemental analysiscalcd:found:Melting point70-76°       C. C %79.0778.70 H %8.668.75 N %1.561.35      106       ##STR29##       Elemental analysiscalcd:found:Melting point89-94°       C. C %77.6277.09 H %9.469.45 N %2.922.76      107       ##STR30##       Elemental analysiscalcd:found:Melting point83-86°       C. C %77.1176.52 H %10.05       9.99 N %4.734.47                                108       ##STR31##       Elemental analysiscalcd:found:Melting point66-67°       C. C %78.8778.82 H %10.9410.88 N %3.753.66      109       ##STR32##       Elemental analysiscalcd:found:Melting point89-90°       C. C %79.1778.96 H %10.8610.96 N %2.252.19      110       ##STR33##       Elemental analysiscalcd:found:Melting point136-138° C. C      %74.3374.50 H %       9.9510.11 N %2.342.24                     111       ##STR34##       Elemental analysiscalcd:found:Melting point129-134° C. C      %80.9180.72 H %9.819.92 N %2.102.04      112       ##STR35##       Elemental analysiscalcd:found:Melting point150-152° C. C      %76.6476.65 H %9.919.91 N %2.422.37      113       ##STR36##       Elemental analysiscalcd:found:Melting point102-104° C. C      %79.1779.02 H %10.8610.74 N %2.252.12      114       ##STR37##       Elemental analysiscalcd:found:Melting point85-86°       C. C %79.7179.45 H %11.1510.96 N %2.071.92      115       ##STR38##       Elemental analysiscalcd:found:Melting point62-64°       C. C %80.1680.10 H %11.4011.39 N %1.911.70      116       ##STR39##       Elemental analysiscalcd:found:Melting point64-69°       C. C %80.3680.37 H %11.5011.55 N %1.841.79      117       ##STR40##       Elemental analysiscalcd:found:Melting point121-122° C. C      %74.5874.61 H %9.649.90 N %2.352.37      118       ##STR41##       Elemental analysiscalcd:found:Melting point148° C. C %78.5078.43 H       %10.2510.20 N %2.542.58      119       ##STR42##       Elemental analysiscalcd:found:Melting point72-75° C. (amorph) C  7      %9.1278.58 H %10.1310.52 N %2.432.40      120       ##STR43##       Elemental analysiscalcd:found:Melting point102-108° C. (amorph)      C %78.9878.26 H %10.2910.43 N %2.422.42       121       ##STR44##       ##STR45##       122       ##STR46##       Elemental analysiscalcd:found:Melting point123° C. C %78.0177.74 H       %9.339.33 N %2.272.27      201       ##STR47##       Elemental analysiscalcd:found:Melting point104-105° C. C      %76.4276.06 H %9.809.72 N %2.482.40      202       ##STR48##       Elemental analysiscalcd:found:Melting point46-47°       C. C %78.0278.00 H %10.9610.71 N %1.981.88      203       ##STR49##       Elemental analysiscalcd:found:Melting point101-105° C. C      %79.8379.58 H %10.5610.53      204       ##STR50##       Elemental analysiscalcd:found:Melting point114-115° C. C      %79.0579.04 H %10.6811.08      205       ##STR51##       Elemental analysiscalcd:found:Melting point85-87°       C. C %78.4078.45 H %10.3110.32      206       ##STR52##       Elemental analysiscalcd:found:Melting point69-71°       C. C %79.3379.34 H %10.8410.98      207       ##STR53##       Elemental analysiscalcd:found:Melting point71-73°       C. C %79.5979.30 H %10.9811.26      208       ##STR54##       Elemental analysiscalcd:found:Melting point87-91°       C. C %79.0178.54 H %10.2010.27      209       ##STR55##       Elemental analysiscalcd:found:Melting point64-74°       C. C %79.0579.10 H %10.6810.69      210       ##STR56##       Elemental analysiscalcd:found:Melting point65-67°       C. C %80.2680.29 H %11.3611.33      211       ##STR57##       Elemental analysiscalcd:found:Melting point74-78° C. (amorph) C  7      %4.7274.53 H %       9.9710.02                    212       ##STR58##       Elemental analysiscalcd:found: C %75.1975.12 H %10.1610.19      213       ##STR59##       Elemental analysiscalcd:found:Melting point65-66°       C. C %74.0874.10 H %9.919.91      214       ##STR60##       Elemental analysiscalcd:found: C %79.1279.27 H %9.799.99                                                                               2      14bis       ##STR61##       Elemental analysiscalcd:found:Melting point103-105° C. C      %78.0577.96 H %9.279.25      215       ##STR62##       Elemental analysiscalcd:found:Melting point88-91°       C. C %76.6876.56 H %10.2310.56      216       ##STR63##       Elemental analysiscalcd:found:Melting point94° C. C %78.0778.04      H %9.889.84      217       ##STR64##       Elemental analysiscalcd:found:Melting point72-73°       C. C %77.0276.92 H %9.799.67      218       ##STR65##       Elemental analysiscalcd:found:Melting point51-53°       C. C %76.8075.54 H %10.0810.29      219       ##STR66##       Elemental analysiscalcd:found:Melting point185° C. C %80.7580.62 H       %10.0910.12      220       ##STR67##       Elemental analysiscalcd:found:Melting point113-116° C. C      %79.8279.70 H %9.289.33      221       ##STR68##       Elemental analysiscalcd:found:Melting point118-121° C. C      %77.3177.07 H %9.829.57 N %2.312.22      222       ##STR69##       Elemental analysiscalcd:found:Melting point98° C. C %76.4776.37      H %10.1310.39      223       ##STR70##       Elemental analysiscalcd:found:Melting point91-93°       C. C %76.7275.99 H %9.839.68      224       ##STR71##       Elemental analysiscalcd:found:Melting point83-85°       C. C %76.4776.35 H %10.1310.25      225       ##STR72##       Elemental analysiscalcd:found:Melting point117-120° C. C      %76.6876.45 H %10.2310.33      301       ##STR73##       Elemental analysiscalcd:found:Melting point C %73.3472.83 H %9.419.41 S      %5.765.30      302       ##STR74##       Elemental analysiscalcd:found:Melting point108-113° C. C      %71.2971.36 H %9.159.23 N %5.605.65      401       ##STR75##       Elemental analysiscalcd:found:Melting point160-162° C. C      %74.8374.77 H %9.159.22 N %7.487.03      402       ##STR76##       Elemental analysiscalcd:found:Melting point88-92°       C. C %77.1076.94 H %9.359.40 N %5.004.91      403       ##STR77##       Elemental analysiscalcd:found:Melting point174-178° C. C      %76.5676.30 H %8.738.70 N %6.876.87      404       ##STR78##       Elemental analysiscalcd:found:Melting point81-84°       C. C %76.7676.22 H %8.869.20 N %6.716.57      405       ##STR79##       Elemental analysiscalcd:found:Melting point123-128° C. C      %72.8072.58 H %8.098.08 N %2.122.16 S %9.729.79      Compounds 113, 116, 117, 215 and 222 are particularly preferred      embodiments of the invention.

The compounds of formula I are suitable for stabilising organic materials against thermal, oxidative or light-induced degradation. Illustrative examples of such materials are:

1. Polymers of monoolefins and diolefins, for example polypropylene, polyisobutylene, polybut-1-ene, poly-4-methylpent-1-ene, polyisoprene or polybutadiene, as well as polymers of cycloolefins, for instance of cyclopentene or norbornene, polyethylene (uncrosslinked or crosslinked), for example high density polyethylene (HDPE), high density and high molecular weight polyethylene (HDPE-HMW), high density and ultrahigh molecular weight polyethylene (HDPE-UHMW), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), branched low density polyethylene (BLDPE).

Polyolefins, i.e. the polymers of monoolefins exemplified in the preceding paragraph, preferably polyethylene and polypropylene, can be prepared by different, and especially by the following, methods:

a) radical polymerisation (normally under high pressure and at elevated temperature).

b) catalytic polymerisation using a catalyst that normally contains one or more than one metal of groups IVb, Vb, VIb or VIII of the Periodic Table. These metals usually have one or more than one ligand, typically oxides, halides, alcoholates, esters, ethers, amines, alkyls, alkenyls and/or aryls that may be either π- or σ-coordinated. These metal complexes may be in the free form or fixed on substrates, typically on activated magnesium chloride, titanium(III) chloride, alumina or silicon oxide. These catalysts may be soluble or insoluble in the polymerisation medium. The catalysts can be used by themselves in the polymerisation or further activators may be used, typically metal alkyls, metal hydrides, metal alkyl halides, metal alkyl oxides or metal alkyloxanes, said metals being elements of groups Ia, IIa and/or IIIa of the Periodic Table. The activators may be modified conveniently with further ester, ether, amine or silyl ether groups. These catalyst systems are usually termed Phillips, Standard Oil Indiana, Ziegler (-Natta), TNZ (DuPont), metallocene or single site catalysts (SSC).

2. Mixtures of the polymers mentioned under 1), for example mixtures of polypropylene with polyisobutylene, polypropylene with polyethylene (for example PP/HDPE, PP/LDPE) and mixtures of different types of polyethylene (for example LDPE/HDPE).

3. Copolymers of monoolefins and diolefins with each other or with other vinyl monomers, for example ethylene/propylene copolymers, linear low density polyethylene (LLDPE) and mixtures thereof with low density polyethylene (LDPE), propylene/but-1-ene copolymers, propylene/isobutylene copolymers, ethylene/but-1-ene copolymers, ethylene/hexene copolymers, ethylene/methylpentene copolymers, ethylene/heptene copolymers, ethylene/octene copolymers, propylene/butadiene copolymers, isobutylene/isoprene copolymers, ethylene/alkyl acrylate copolymers, ethylene/alkyl methacrylate copolymers, ethylene/vinyl acetate copolymers and their copolymers with carbon monoxide or ethylene/acrylic acid copolymers and their salts (ionomers) as well as terpolymers of ethylene with propylene and a diene such as hexadiene, dicyclopentadiene or ethylidene-norbornene; and mixtures of such copolymers with one another and with polymers mentioned in 1) above, for example polypropylene/ethylene-propylene copolymers, LDPE/ethylene-vinyl acetate copolymers (EVA), LDPE/ethylene-acrylic acid copolymers (EAA), LLDPE/EVA, LLDPE/EAA and alternating or random polyalkylene/carbon monoxide copolymers and mixtures thereof with other polymers, for example polyamides.

4. Hydrocarbon resins (for example C₅ -C₉) including hydrogenated modifications thereof (e.g. tackifiers) and mixtures of polyalkylenes and starch.

5. Polystyrene, poly(p-methylstyrene), poly(α-methylstyrene).

6. Copolymers of styrene or α-methylstyrene with dienes or acrylic derivatives, for example styrene/butadiene, styrene/acrylonitrile, styrene/alkyl methacrylate, styrene/butadiene/alkyl acrylate, styrene/butadiene/alkyl methacrylate, styrene/maleic anhydride, styrene/acrylonitrile/methyl acrylate; mixtures of high impact strength of styrene copolymers and another polymer, for example a polyacrylate, a diene polymer or an ethylene/propylene/diene terpolymer; and block copolymers of styrene such as styrene/butadiene/styrene, styrene/isoprene/styrene, styrene/ethylene/butylene/styrene or styrene/ethylene/propylene/styrene.

7. Graft copolymers of styrene or α-methylstyrene, for example styrene on polybutadiene, styrene on polybutadiene-styrene or polybutadiene-acrylonitrile copolymers; styrene and acrylonitrile (or methacrylonitrile) on polybutadiene; styrene, acrylonitrile and methyl methacrylate on polybutadiene; styrene and maleic anhydride on polybutadiene; styrene, acrylonitrile and maleic anhydride or maleimide on polybutadiene; styrene and maleimide on polybutadiene; styrene and alkyl acrylates or methacrylates on polybutadiene; styrene and acrylonitrile on ethylene/propylene/diene terpolymers; styrene and acrylonitrile on polyalkyl acrylates or polyalkyl methacrylates, styrene and acrylonitrile on acrylate/butadiene copolymers, as well as mixtures thereof with the copolymers listed under 6), for example the copolymer mixtures known as ABS, MBS, ASA or AES polymers.

8. Halogen-containing polymers such as polychloroprene, chlorinated rubbers, chlorinated or sulfochlorinated polyethylene, copolymers of ethylene and chlorinated ethylene, epichlorohydrin homo- and copolymers, especially polymers of halogen-containing vinyl compounds, for example polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, as well as copolymers thereof such as vinyl chloride/vinylidene chloride, vinyl chloride/vinyl acetate or vinylidene chloride/vinyl acetate copolymers.

9. Polymers derived from α,β-unsaturated acids and derivatives thereof such as polyacrylates and polymethacrylates; polymethyl methacrylates, polyacrylamides and polyacrylonitriles, impact-modified with butyl acrylate.

10. Copolymers of the monomers mentioned under 9) with each other or with other unsaturated monomers, for example acrylonitrile/butadiene copolymers, acrylonitrile/alkyl acrylate copolymers, acrylonitrile/alkoxyalkyl acrylate or acrylonitrile/vinyl halide copolymers or acrylonitrile/alkyl methacrylate/butadiene terpolymers.

11. Polymers derived from unsaturated alcohols and amines or the acyl derivatives or acetals thereof, for example polyvinyl alcohol, polyvinyl acetate, polyvinyl stearate, polyvinyl benzoate, polyvinyl maleate, polyvinyl butyral, polyallyl phthalate or polyallyl melamine; as well as their copolymers with olefins mentioned in 1) above.

12. Homopolymers and copolymers of cyclic ethers such as polyalkylene glycols, polyethylene oxide, polypropylene oxide or copolymers thereof with diglycidyl ethers.

13. Polyacetals such as polyoxymethylene and those polyoxymethylenes which contain ethylene oxide as a comonomer; polyacetals modified with thermoplastic polyurethanes, acrylates or MBS.

14. Polyphenylene oxides and sulfides, and mixtures of polyphenylene oxides with styrene polymers or polyamides.

15. Polyurethanes derived from hydroxyl-terminated polyethers, polyesters or polybutadienes on the one hand and aliphatic or aromatic polyisocyanates on the other, as well as precursors thereof.

16. Polyamides and copolyamides derived from diamines and dicarboxylic acids and/or from aminocarboxylic acids or the corresponding lactams, for example polyamide 4, polyamide 6, polyamide 6/6, 6/10, 6/9, 6/12, 4/6, 12/12, polyamide 11, polyamide 12, aromatic polyamides starting from m-xylene diamine and adipic acid; polyamides prepared from hexamethylenediamine and isophthalic or/and terephthalic acid and with or without an elastomer as modifier, for example poly-2,4,4,-trimethylhexamethylene terephthalamide or poly-m-phenylene isophthalamide; and also block copolymers of the aforementioned polyamides with polyolefins, olefin copolymers, ionomers or chemically bonded or grafted elastomers; or with polyethers, e.g. with polyethylene glycol, polypropylene glycol or polytetramethylene glycol; as well as polyamides or copolyamides modified with EPDM or ABS; and polyamides condensed during processing (RIM polyamide systems).

17. Polyureas, polyimides, polyamide-imides, polyether imides, polyester imides, polyhydantoins and polybenzimidazoles.

18. Polyesters derived from dicarboxylic acids and diols and/or from hydroxycarboxylic acids or the corresponding lactones, for example polyethylene terephthalate, polybutylene terephthalate, poly-1,4-dimethylolcyclohexane terephthalate and polyhydroxybenzoates, as well as block copolyether esters derived from hydroxyl-terminated polyethers; and also polyesters modified with polycarbonates or MBS.

19. Polycarbonates and polyester carbonates.

20. Polysulfones, polyether sulfones and polyether ketones.

21. Crosslinked polymers derived from aldehydes on the one hand and phenols, ureas and melamines on the other hand, such as phenol/formaldehyde resins, urea/formaldehyde resins and melamine/formaldehyde resins.

22. Drying and non-drying alkyd resins.

23. Unsaturated polyester resins derived from copolyesters of saturated and unsaturated dicarboxylic acids with polyhydric alcohols and vinyl compounds as crosslinking agents, and also halogen-containing modifications thereof of low flammability.

24. Crosslinkable acrylic resins derived from substituted acrylates, for example epoxy acrylates, urethane acrylates or polyester acrylates.

25. Alkyd resins, polyester resins and acrylate resins crosslinked with melamine resins, urea resins, isocyanates, isocyanurates, polyisocyanates or epoxy resins.

26. Crosslinked epoxy resins derived from aliphatic, cycloaliphatic, heterocyclic or aromatic glycidyl compounds, e.g. products of diglycidyl ethers of bisphenol A and bisphenol F, which are crosslinked with customary hardeners such as anhydrides or amines, with or without accelerators.

27. Natural polymers such as cellulose, rubber, gelatin and chemically modified homologous derivatives thereof, for example cellulose acetates, cellulose propionates and cellulose butyrates, or the cellulose ethers such as methyl cellulose; as well as rosins and their derivatives.

28. Blends of the aforementioned polymers (polyblends), for example PP/EPDM, Polyamide/EPDM or ABS, PVC/EVA, PVC/ABS, PVC/MBS, PC/ABS, PBTP/ABS, PC/ASA, PC/PBT, PVC/CPE, PVC/acrylates, POM/thermoplastic PUR, PC/thermoplastic PUR, POM/acrylate, POM/MBS, PPO/HIPS, PPO/PA 6.6 and copolymers, PA/HDPE, PA/PP, PA/PPO, PBT/PC/ABS or PBT/PET/PC.

29. Naturally occurring and synthetic organic materials which are pure monomeric compounds or mixtures of such compounds, for example mineral oils, animal and vegetable fats, oil and waxes, or oils, fats and waxes based on synthetic esters (e.g. phthalates, adipates, phosphates or trimellitates) and also mixtures of synthetic esters with mineral oils in any weight ratios, typically those used as spinning compositions, as well as aqueous emulsions of such materials.

30. Aqueous emulsions of natural or synthetic rubber, e.g. natural latex or latices of carboxylated styrene/butadiene copolymers.

The invention thus also relates to a composition comprising an organic material stabilised against oxidative, thermal or light-induced degradation and at least one compound of formula I.

The organic material is preferably a synthetic polymer, more particularly one selected from the aforementioned groups. Polyolefins and a solution-polymerised polybutadiene rubber are particularly preferred. A further particularly preferred organic material is a solution-polymerised styrene-butadiene copolymer or styrene-butadiene block copolymer in which the ratio of styrene to conjugated butadiene is conveniently 5:95 to 95:5. The polybutadiene component in these copolymers is c. 5 to 30%. A preferred organic material is also acrylonitrile-butadiene-styrene.

The compounds of formula I are usually incorporated in the material to be stabilised in amounts of 0.01 to 10%, preferably 0.01 to 5%, most preferably 0.05 to 0.5%, based on the total weight of the material to be stabilised.

The novel compounds are incorporated in the organic material by known methods, conveniently before or during shaping to moulded articles or alternatively by coating the organic material with a solution or dispersion of the compounds and subsequently removing any solvent used by evaporation. The novel compounds can be incorporated in the material to be stabilised as powder, granulate or also in the form of a masterbatch which contains these compounds in a concentration of 2.5 to 25% by weight.

The compounds of formula I can also be incorporated in the organic material before or during polymerisation or before crosslinking.

The stabilised materials may be in any form of presentation, typically sheets, filaments, ribbons, mouldings, profiles or binders for coating compositions, adhesives or putties.

Further different customary additives may also be incorporated in the stabilised organic materials, typically including:

1. Antioxidants

1.1. Alkylated monophenols, for example 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2-(α-methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, nonylphenols which are linear or branched in the side chains, for example, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6-(1'-methylundec-1'-yl)phenol, 2,4-dimethyl-6-(1'-methylheptadec-1'-yl)phenol, 2,4-dimethyl-6-(1'-methyltridec-1'-yl)phenol and mixtures thereof.

1.2. Alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-do-decylthiomethyl-4-nonylphenol.

1.3. Hydroquinones and alkylated hydroquinones, for example 2,6-di-ten-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis(3,5-di-tert-butyl-4-hydroxyphenyl)adipate.

1.4. Tocopherols, for example α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol and mixtures thereof (vitamin E).

1.5. Hydroxylated thiodiphenyl ethers, for example 2,2'-thiobis(6-tert-butyl-4-methylphenol), 2,2'-thiobis(4-octylphenol), 4,4'-thiobis(6-tert-butyl-3-methylphenol), 4,4'-thiobis(6-tert-butyl-2-methylphenol), 4,4'-thiobis(3,6-di-sec-amylphenol), 4,4'-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide.

1.6. Alkylidenebisphenols, for example 2,2'-methylenebis(6-tert-butyl-4-methylphenol), 2,2'-methylenebis(6-tert-butyl-4-ethylphenol), 2,2'-methylenebis[4-methyl-6-(α-methylcyclohexyl)phenol], 2,2'-methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-methylenebis(6-nonyl-4-methylphenol), 2,2'-methylenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2'-methylenebis[6-(α-methylbenzyl)-4-nonylphenol], 2,2'-methylenebis[6-(α,α-dimethylbenzyl)-4-nonylphenol], 4,4'-methylenebis(2,6-di-tert-butylphenol), 4,4'-methylenebis(6-tert-butyl-2-methylphenol), 1,1-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris( 5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 1,1-bis(5-tert-butyl-4-hydroxy-2-methyl-phenyl)-3-n-dodecylmercaptobutane, ethylene glycol bis[3,3-bis(3'-tert-butyl-4'-hydroxyphenyl)butyrate], bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopentadiene, bis[2-(3'-tert-butyl-2'-hydroxy-5'-methylbenzyl)-6-tert-butyl-4-methylphenyl]terephthalate, 1,1-bis(3,5-dimethyl-2-hydroxyphenyl)butane, 2,2-bis(3,5-di-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)-4-n-dodecylmercaptobutane, 1,1,5,5-tetra(5-tert-butyl-4-hydroxy-2-methylphenyl)pentane.

1.7O-, N- and S-benzyl compounds, for example 3,5,3',5'-tetra-tert-butyl-4,4'-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, tris(3,5-di-tert-butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithioterephthalate, bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, isooctyl-3,5-di-tert-butyl-4-hydroxybenzylmercaptoacetale.

1.8. Hydroxybenzylated malonates, for example dioctadecyl-2,2-bis(3,5-di-tert-butyl-2-hydroxybenzyl)malonate, dioctadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)malonate, didodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, bis[4(1,1,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.

1.9. Aromatic hydroxybenzyl compounds, for example 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 1,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol.

1.10. Triazine compounds, for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,3,5-triazine, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,2,3-triazine, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanutrate, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenylethyl)-1,3,5-triazine, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexahydro-1,3,5-triazine, 1,3,5-tris(3,5-dicyclohexyl-4-hydroxybenzyl)isocyanurate.

1.11. Benzylphosphonates, for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy-3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid.

1.12. Acylaminophenols, for example 4-hydroxylauranilide, 4-hydroxystearanilide, octyl N-(3,5-di-tert-butyl-4-hydroxyphenyl)carbamate.

1.13. Esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

1.14. Esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

1.15. Esters of β-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.21]octane.

1.16. Esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.21]octane.

1.17. Amides of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, e.g. N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)trimethylenediamine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine.

1.18. Ascorbic acid (vitamin C)

1.19. Aminic antioxidants, for example N,N'-di-isopropyl-p-phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine, N,N'-bis(1-ethyl-3-methylpentyl)-p-phenylenediamine, N,N'-bis(1-methylheptyl)-p-phenylenealiamine, N,N'-dicyclohexyl-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N,N'-bis(2-naphthyl)-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N-(1-methylheptyl)-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, 4-(p-toluenesulfamoyl)diphenylamine, N,N'-dimethyl-N,N'-di-sec-butyl-p-phenylenediamine, diphenylamine, N-allyldiphenylamine, 4-isopropoxydiphenylamine, N-phenyl-1-naphthylamine, N-(4-tert-octylphenyl)-1-naphthylamine, N-phenyl-2-naphthylamine, octylated diphenylamine, for example p,p'-di-tert-octyldiphenylamine, 4-n-butylaminophenol, 4-butyrylaminophenol, 4-nonanoylamino-phenol, 4-dodecanoylaminophenol, 4-octadecanoylaminophenol, bis(4-methoxyphenyl)amine, 2,6-di-tert-butyl-4-dimethylaminomethylphenol, 2,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, N,N,N',N'-tetramethyl-4,4'-diaminodiphenylmethane, 1,2-bis[(2-methylphenyl)amino]ethane, 1,2-bis(phenylamino)propane, (o-tolyl)biguanide, bis[4-(1',3'-dimethylbutyl)phenyl]amine, tert-octylated N-phenyl-1-naphthylamine, a mixture of mono- and dialkylated tert-butyl/tert-octyldiphenylamines, a mixture of mono- and dialkylated nonyldiphenylamines, a mixture of mono- and dialkylated dodecyldiphenylamines, a mixture of mono- and dialkylated isopropyl/isohexyldiphenylamines, a mixture of mono- und dialkylated tert-butyldiphenylamines, 2,3-dihydro-3,3-dimethyl-4H-1,4-benzothiazine, phenothiazine, a mixture of mono- und dialkylated tert-butyl/tert-octylphenothiazines, a mixture of mono- und dialkylated tert-octylphenothiazines, N-allylphenothiazine, N,N,N',N'-tetraphenyl-1,4-diaminobut-2-ene, N,N-bis(2,2,6,6-tetramethyl-piperid-4-yl-hexamethylenediamine, bis(2,2,6,6-tetramethylpiperid-4-yl)sebacate, 2,2,6,6-tetramethylpiperidin-4-one, 2,2,6,6-tetramethylpiperidin-4-ol.

2. UV absorbers and light stabilisers

2.1.2-(2'-Hydroxyphenyl)benzotriazoles, for example 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-methylphenyl)-5-chlorobenzotriazole, 2-(3'-sec-butyl-5'-tert-butyl-2'hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-4'-octyloxyphenyl)benzotriazole, 2-(3',5'-di-tert-amyl-2'-hydroxyphenyl)benzotriazole, 2-(3',5'-bis-(α,α-dimethylbenzyl)-2'-hydroxyphenyl)benzotriazole, mixture of 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)-carbonylethyl]-2'-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2methoxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)carbonylethyl]-2'-hydroxyphenyl)benzotriazole, 2-(3'-dodecyl-2'-hydroxy-5'-methylphenyl)benzotriazole, and 2-(3'-tert-butyl-2'-hydroxy-5'-(2-isooctyloxycarbonylethyl)phenylbenzotriazole, 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazol-2-ylphenol]; the transesterification product of 2-[3'-tert-butyl-5'-(2-methoxycarbonylethyl)-2'-hydroxyphenyl]-2H-benzotriazole with polyethylene glycol 300; [R--CH₂ CH₂ --COO(CH₂)₃ .brket close-st.₂, where R=3'-tert-butyl-4'-hydroxy-5'-2H-benzotriazol-2-ylphenyl.

2.2.2-Hydroxybenzophenones, for example the 4-hydroxy, 4-methoxy, 4-octyloxy, 4-decyloxy, 4-dodecyloxy, 4-benzyloxy, 4,2',4'-trihydroxy and 2'-hydroxy-4,4'-dimethoxy derivatives.

2.3. Esters of substituted and unsubstituted benzoic acids, for example 4-tert-butylphenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoyl resorcinol, bis(4-tert-butylbenzoyl) resorcinol, benzoyl resorcinol, 2,4-di-tertbutylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate.

2.4. Acrylates, for example ethyl α-cyano-β,β-diphenylacrylate, isooctyl α-cyano-β,β-diphenylacrylate, methyl α-carbomethoxycinnamate, methyl α-cyano-β-methyl-p-methoxycinnamate, butyl α-cyano-β-methyl-p-methoxy-cinnamate, methyl α-carbomethoxy-p-methoxycinnamate and N-(β-carbomethoxy-β-cyanovinyl)-2-methylindoline.

2.5. Nickel compounds, for example nickel complexes of 2,2'-thio-bis-[4-(1,1,3,3-tetramethylbutyl)phenol], such as the 1:1 or 1:2 complex, with or without additional ligands such as n-butylamine, triethanolamine or N-cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of the monoalkyl esters, e.g. the methyl or ethyl ester of 4-hydroxy-3,5-di-tert-butylbenzylphosphonic acid, nickel complexes of ketoximes, e.g. of 2-hydroxy-4-methylphenyl undecylketoxime, nickel complexes of 1-phenyl-4-lauroyl-5-hydroxypyrazole, with or without additional ligands.

2.6. Sterically hindered amines., for example bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(2,2,6,6-tetramethyl-4-piperidyl)succinate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate, the condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, the condensate of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine, tris(2,2,6,6-tetramethyl-4-piperidyl)nitrilotriacetate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, 1,1'-(1,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone), 4-benzoyl-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethylpiperidine, bis( 1,2,2,6,6-pentamethylpiperidyl)-2-n-butyl-2-(2-hydroxy-3,5-di-tert-butylbenzyl)malonate, 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione, bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl)sebacate, bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl)succinate, the condensate of N,N'-bis(2,2,6,6-tetra-methyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine, the condensate of 2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl )-1,3,5-triazine and 1,2-bis(3-aminopropylamino)ethane, the condensate of 2-chloro-4,6-bis(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane, 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione, 3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidine-2,5-dione, 3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione, a mixture of 4-hexadecyloxy and 4-stearyloxy-2,2,6,6-tetramethylpiperidine, a condensation product of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1,3,5-triazine, a condensation product of 1,2-bis(3-aminopropylamino)ethane and 2,4,6-trichloro-1,3,5-triazine as well as 4-butylamino-2,2,6,6-tetramethylpiperidine (CAS Reg. No. [136504-96-6]); N-(2,2,6,6-tetramethyl-4-piperidyl)-n-dodecylsuccinimide, N-(1,2,2,6,6-pentamethyl-4-piperidyl)-n-dodecylsuccinimide, 2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro[4,5]decane, a reaction product of 7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro [4,5]decane und epichlorohydrin.

2.7. Oxamides, for example 4,4'-dioctyloxyoxanilide, 2,2'-diethoxyoxanilide, 2,2'-dioctyloxy-5,5'-di-tert-butoxanilide, 2,2'-didodecyloxy-5,5'-di-tert-butoxanilide, 2-ethoxy-2'-ethyloxanilide, N,N'-bis(3-dimethylaminopropyl)oxamide, 2-ethoxy-5-tert-butyl-2'-ethoxanilide and the mixture thereof with 2-ethoxy-2'-ethyl-5,4'-di-tert-butoxanilide and mixtures of ortho- and para-methoxy-disubstituted oxanilides and mixtures of o- and p-ethoxy-disubstituted oxanilides.

2.8.2-(2-Hyrdoroxyphenyl)-1,3,5-triazines, for example 2,4,6-tris(2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2,4-bis(2-hydroxy-4-propyloxyphenyl)-6-(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(4-methylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-dodecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-tridecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3-butyloxy-propoxy)phenyl]-4,6-bis(2,4-dimethyl)-1,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3-octyloxy-propyloxy)phenyl]-4,6-bis(2,4-dimethyl)-1,3,5-triazine, 2-[4-(dodecyloxy/tridecyloxy-2-hydroxypropoxy)-2-hydroxy-phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3-dodecyloxy-propoxy)phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-hexyloxy)phenyl-4,6-diphenyl-1,3,5-triazine, 2-(2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-1,3,5-triazine, 2,4,6-tris[2-hydroxy-4-(3-butoxy-2-hydroxy-propoxy)phenyl]-1,3,5-triazine, 2-(2-hydroxyphenyl)-4-(4-methoxyphenyl)-6-phenyl-1,3,5-triazine.

3. Metal deactivators, for example N,N'-diphenyloxamide, N-salicylal-N'-salicyloyl hydrazine, N,N'-bis(salicyloyl) hydrazine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl) hydrazine, 3-salicyloylamino-1,2,4-triazole, bis(benzylidene)oxalyl dihydrazide, oxanilide, isophthaloyl dihydrazide, sebacoyl bisphenylhydrazide, N,N'-diacetyladipoyl dihydrazide, N,N'-bis(salicyloyl)oxalyl dihydrazide, N,N'-bis(salicyloyl)thiopropionyl dihydrazide.

4. Phosphites and phosphonites, for example triphenyl phosphite, diphenyl alkyl phosphites, phenyl dialkyl phosphites, tris(nonylphenyl) phosphite, trilauryl phosphite, trioctadecyl phosphite, distearyl pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, diisodecyloxypentaerythritol diphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)pentaerythritol diphosphite, bis(2,4,6-tris(tert-butylphenyl)pentaerythritol diphosphite, tristearyl sorbitol triphosphite, tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylene diphosphonite, 6-isooctyloxy-2,4,8,10-tetra-tert-butyl-12H-dibenzo[d,g]-1,3,2-dioxaphosphocine, 6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyldibenzo[d,g]-1,3,2-dioxaphosphocin, bis(2,4-di-tert-butyl-6-methylphenyl)methylphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethylphosphite.

5. Hydroxylamines, for example, N,N-dibenzylhydroxylamine, N,N-diethylhydroxylamine, N,N-dioctylhydroxylamine, N,N-dilaurylhydroxylamine, N,N-ditetradecylhydroxylamine, N,N-dihexadecylhydroxylamine, N,N-dioctadecylhydroxylamine, N-hexadecyl-N-octadecylhydroxylamine, N-heptadecyl-N-octadecylhydroxylamine, N,N-dialkylhydroxylamine derived from hydrogenated tallow amine.

6. Nitrones, for example N-benzyl-alpha-phenyl-nitrone, N-ethyl-alpha-methyl-nitrone, N-octyl-alpha-heptyl-nitrone, N-lauryl-alpha-undecyl-nitrone, N-tetradecyl-alpha-tridecyl-nitrone, N-hexadecyl-alpha-pentadecyl-nitrone, N-octadecyl-alpha-heptadecyl-nitrone, N-hexadecyl-alpha-heptadecyl-nitrone, N-ocatadecyl-alpha-pentadecyl-nitrone, N-hepta-decyl-alpha-heptadecyl-nitrone, N-octadecyl-alpha-hexadecyl-nitrone, nitrone derived from N,N-dialkylhydroxylamine derived from hydrogenated tallow amine.

7. Thiosynergists, for example, dilauryl thiodipropionate or distearyl thiodipropionate.

8. Peroxide scavengers, for example esters of β-thiodipropionic acid, for example the lauryl, stearyl, myristyl or tridecyl esters, mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole, zinc dibutyldithiocarbamate, dioctadecyl disulfide, pentaerythritol tetrakis(β-dodecylmercapto)propionate.

9. Polyamide stabilisers, for example copper salts in combination with iodides and/or phosphorus compounds and salts of divalent manganese.

10. Basic co-stabilisers, for example melamine, polyvinylpyrrolidone, dicyandiamide, triallyl cyanurate, urea derivatives, hydrazine derivatives, amines, polyamides, polyurethanes, alkali metal salts and alkaline earth metal salts of higher fatty acids, e.g. calcium stearate, zinc stearate, magnesium behenate, magnesium stearate, sodium ricinoleate and potassium palmitate, antimony pyrocatecholate or tin pyrocatecholate.

11. Nucleating agents, for example inorganic substances such as talcum, metal oxides such as titanium dioxide or magnesium oxide, phosphates, carbonates or sulfates of, preferably, alkaline earth metals; organic compounds such as mono- or polycarboxylic acids and the salts thereof, e.g. 4-tert-butylbenzoic acid, adipic acid, diphenylacetic acid, sodium succinate or sodium benzoate; polymeric compounds such as ionic copolymers ("ionomers").

12. Fillers and reinforcing agents, for example, calcium carbonate, silicates, glass fibres, glass beads, asbestos, talc, kaolin, mica, barium sulfate, metal oxides and hydroxides, carbon black, graphite, sawdust or fibers of other natural products, synthetic fibers.

13. Other additives, for example, plasticisers, lubricants, emulsifiers, pigments, rheology additives, catalysts, flow-control agents, fluorescent whitening agents, flame-proofing agents, antistatic agents and blowing agents.

14. Benzofuranones and indolinones, for example those disclosed in U.S. Pat. No. 4,325,863, U.S. Pat. No. 4,338,244, U.S. Pat. No. 5,175,312, U.S. Pat. No. 5,216,052, U.S. Pat. No. 5,252,643, DE-A-4 316 611, DE-A-4 316 622, DE-A-4 316 876, EP-A-0 589 839 or EP-A-0 591 102 or 3-[4-(2-acetoxyethoxy)phenyl]-5,7-di-tert-butylbenzofuran-2-one, 5,7-di-tert-butyl-3-[4-(2-stearoyloxyethoxy)phenyl]benzofuran-2-one, 3,3'-bis[5,7-di-tert-butyl-3-(4-[2-hydroxyethoxy]phenyl)benzofuran-2-one], 5,7-di-tert-butyl-3-(4-ethoxyphenyl)benzofuran-2-one, 3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one, 3-(3,5-dimethyl-4-pivaloyloxyphenyl)-5,7-di-tert-butylbenzofuran-2-one.

The weight ratio of the novel stabiliser to the customary additive may be 1:0.5 to 1:5.

A further object of the invention is the use of the novel stabilisers for stabilising organic material against oxidative, thermal or light-induced degradation.

The invention is illustrated in more detail by the following Examples in which percentages are by weight, unless otherwise indicated.

EXAMPLE 1

Preparation of compound 101 (Process A)

7.2 g (18 mmol) of 2,2'-methylenebis[6-tert-butyl-4-methylphenol] monoacrylate are dissolved in 70 ml of dichloromethane. Then 2.17 ml (20 mmol) of benzylamine are slowly added dropwise at room temperature (RT) to this solution. Afterwards the mixture is further stirred for 3 hours at RT. The solvent is stripped off and the residue is chromatographed over silica gel (eluant: hexane), affording 6.63 g (66%) of compound 101 as a white powder. The melting point is 124°-126° C.

Compounds 102-104 are prepared in accordance with the method described in this Example.

EXAMPLE 2

Preparation of compound 105 (process A).

16.57 g (42 mmol) of 2,2'-methylenebis[6-tert-butyl-4-methylphenol] monoacrylate and 2.17 ml (20 mmol) of benzylamine in 150 ml dichloroethane are charged, under argon, to a round-bottomed flask fitted with magnetic stirrer and condenser. The reaction mixture is refluxed overnight and subsequently concentrated on a vacuum rotary evaporator. Chromatography of the residue over silica gel (eluant: hexane→Hex/EA 80:1; Hex=hexane, EA=ethyl acetate) yields 12.44 g (69%) of compound 105 as a white powder. The melting point is 70°-76° C.

Compounds 106-110 are prepared in accordance with the method described in this Example.

EXAMPLE 3

Preparation of compound 111 (process A).

A mixture of 4.6 g (8.3 mmol) 2,2'-ethylidenebis[4,6-di-tert-amylphenol] monoacrylate and 1 g (4.16 mmol) of N,N'-dibenzylethylenediamine is stirred for 4 hours at 140° C. The reaction mixture is cooled to RT and the crude product is chromatographed over silica gel (eluant: hexane), affording 5.15 g (93%) of compound 111 as an amorphous powder. The melting point is 129°-134° C.

EXAMPLE 4

Preparation of compound 112 (process C).

a) Preparation of 2,4-di-tert-butyl-6-[1-(3,5-di-tert-butyl-2-hydroxyphenyl)ethyl]phenyl 3-chloropropionate ##STR80##

21.9 g (50 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol] and 48 ml (500 mmol) of 3-chloropropionyl chloride in 100 ml xylene are charged to a 250 ml round bottomed flask fitted with magnetic stirrer, condenser and bubble counter. The mixture is refluxed for 15 hours (evolution of HCl). Excess acid chloride and the toluene are removed by distillation. Crystallisation of the residue in acetonitrile yields 15.8 g (60%) of the desired monoester 112 a as a beige powder. The melting point is 118°-121° C.

    ______________________________________                                         Elemental analysis:                                                                    C %         H %    Cl %                                                ______________________________________                                         calcd:    74.90         9.33   6.70                                            found:    75.10         9.29   6.13                                            ______________________________________                                    

b) 1.63 g (18.7 mmol) of morpholine are added dropwise at RT and under nitrogen to a stirred solution of 4.5 g (8.5 mmol) of compound 112a (Example 4a) in 30 ml of toluene. The reaction mixture is stirred for 1 hour at 70° C., cooled to RT, filtered over Hyflo and concentrated by evaporation.

Crystallisation of the residue in hexane gives 3.9 g (80%) of compound 112 as a white powder. The melting point is 150°-152° C.

EXAMPLE 5

Preparation of compound 113 (process A).

A mixture of 19.7 g (0.04 mol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol] monoacrylate (preparation as described in EP-A-500 323) and 6.72 g (0.052 mol) of octylamine is heated to 115° C. The colourless solution so obtained is stirred for 30 minutes at this temperature. Then 50 ml of ethanol are added. The batch is cooled to RT, whereupon the product crystallises out. The crystalline product is isolated by filtration and dried under vacuum, affording 21.9 g (88%) of compound 113 as a white powder.

The melting point is 102-104° C.

Compounds 114, 115 and 116 are prepared in general accordance with the procedure of this Example.

EXAMPLE 6

Preparation of compound 117 (process A).

6.41 g (13 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate, 2 g (14.3 mmol) of glycine ethyl ester hydrochloride and 50 ml of ethylene chloride are charged, under nitrogen, to a 200 ml sulfonation flask fitted with thermometer, stirrer, reflux condenser and dropping funnel. Then 2 ml (1.45 g, 14.3 mmol) of triethylamine are added dropwise. When this addition is complete, the mixture is heated to 50° C. and stirred for 5 hours at this temperature. The resultant suspension is diluted with 25 ml of hexane and the salts are removed by filtration. The solvent is stripped off on a vacuum rotary evaporator and the crude product is crystallised from hexane, affording 3.7 g (48%) of compound 117 as a white powder. The melting point is 121°-122° C.

EXAMPLE 7

Preparation of compound 118 (process A).

A mixture of 6.92 g (14 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate, and 0.89 g (7.7 mmol) of 1,6-diaminohexane in 40 ml of ethyl acetate is refluxed for 30 minutes. The solvent is then removed by evaporation. Crystallisation of the residue from acetonitrile yields 5 g (65% ) of compound 118 as a white powder. The melting point is 148° C.

EXAMPLE 8

Preparation of compound 121 (process B).

A mixture of 2.05 g (12 mmol) of 3-[2-oxo-piperidino]propionic acid (q.v. Dado, G. P; Gellman, S.H.; J. Am. Chem. Soc., 116(3), 1054-62, 1994), 4.4 g (10 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol], 2.06 g (10 mmol) of dicyclohexylcarbodiimide and 50 mg of dimethylaminopyridine in 60 ml of dichloroethane is refluxed for 15 hours. The precipitated urea is removed by filtration and the solvent is stripped off. Crystallisation of the residue from a 1:1 mixture of hexane/ethyl acetate, yields 2.6 g (44%) of compound 121 as a white powder. The melting point is 217°-223° C.

EXAMPLE 9

Preparation of compound 122 (process A).

A mixture of 6.6 g (13 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate, 4 g (23.5 mmol) of O-benzyl-hydroxylamine hydrochloride and 38 ml (27 mmol) of triethylamine in 70 ml of dichloroethane is refluxed for 8 hours at 65° C. The reaction mixture is diluted with c. 10 ml of hexane, the salts are removed by filtration, and solvent is distilled off on a vacuum rotary evaporator. Crystallisation of the residue from methanol yields 4.6 g (55%) of compoudg 122 as a white powder. The melting point is 123° C.

EXAMPLE 10

Preparation of compound 201 (process A).

5.65 g (33 mmol) of 4-hydroxy-1,2,2,6,6-pentamethylpiperidine in 85 ml of tetrahydrofuran are charged to a 250 ml round bottomed flask which is blanketed with nitrogen. The solution is cooled to 0° C. and 5.6 ml (9 mmol) of a 1.6N solution of butyllithium in hexane are slowly added dropwise. The resultant white suspension is stirred for 30 minutes, and then a solution of 11.84 g (30 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate in 85 ml of tetrahydrofuran is slowly added dropwise. The yellow solution is stirred for 3 hours at RT. The reaction mixture is then concentrated by evaporation and the residue is poured into an aqueous saturated solution of ammonium chloride. After repeated extraction with ethyl acetate the organic phases are combined, dried over potassium carbonate and concentrated on a vacuum rotary evaporator. Chromatography of the residue (SiO₂ :Hex/EA9:1→1:1) yields 11.06 g (65%) of compound 201 as a white powder. The melting point is 104°-105° C.

Compounds 202 and 203 are prepared in general accordance with the procedure described in Example 4.

EXAMPLE 11

Preparation of compound 204 (process B).

a) Preparation of 3-octyloxypropionic acid

21.7 ml (0.33 mol) of acrylonitrile are added dropwise at RT over 25 minutes and under N₂ to a colourless solution of 39.1 g (0.3 mol) of octanol and 1.2 ml (2.9 tool) of benzyltrimethylammonium hydroxide (40% solution in water)(exothermic reaction: Ti 40° C.). When this addition is complete, the reaction mixture is stirred for a further 25 minutes at RT. Excess acrylonitrile is removed by destillation (vacuum rotatary evaporator). The resultant crude 3-octyloxypropionitrile (pale yellow liquid; 97% GC) is dissolved in 150 ml of conc. hydrochloric acid and 150 ml of acetic acid and the solution is heated for 3 hours to 85° C. The mixture is cooled and poured into 100 ml of water. After extraction with ethyl acetate, the organic phase is separated, washed with an aqueous saturated solution of NaCl, dried over Na₂ SO₄, and concentrated on a vacuum rotary evaporator, affording 60 g of 3-octyloxypropionic acid as a colourless liquid (85% GC→85% yield).

    ______________________________________                                         Elemental analysis:                                                                           C %  H %                                                        ______________________________________                                         calcd:           65.31  10.96                                                  found:           64.94  11.09                                                  ______________________________________                                    

b) 7.08 g (35 mmol) of 3-octyloxypropionic acid (q.v. Example 11 a) in 50 ml of toluene are charged, under argon, to a 100 ml round bottomed flask fitted with magnetic stirrer and condenser. To this solution are added 7.6 ml (18.5 g, 105 mmol) of thionyl chloride. The mixture is slowly heated to 90° C. (evolution of HCl and SO₂) and stirred for 2 hours at this temperature. Stirring is then continued for a further 30 minutes while introducing a stream of argon. Under reduced pressure (20 mbar) excess thionyl chloride and the toluene are removed by distillation. The residue (7 g of 3-octyloxypropionyl chloride) is dissolved in 50 ml of toluene and 10.97 g (25 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol] are added. Then 4.9 ml (35 mmol) of triethylamine are added dropwise to this solution at 10° C. After c. 10 minutes the mixture is warmed to RT and stirred for 1 hour for 30 minutes at RT. The reaction mixture is filtered over Celite and the filtrate is concentrated on a vacuum rotary evaporator. The residue is taken up in c. 30 ml of acetonitrile, whereupon compound 204 crystallises. The product is collected by suction filtration and dried, affording 14.05 g (90%) of compound 204 as a white powder. The melting point is 114° C.

The preparation of compounds 205 to 214 is carried out in general accordance with the procedure of this Example.

EXAMPLE 12

Preparation of compound 204 (Process B).

6.6 g (15 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol], 3.8 g (15 mmol) of 3-octyloxypropionic acid and 6 ml of heptane are charged, under N₂ to a 100 ml sulfonation flask fitted with thermometer, stirrer, reflux condenser and dropping funnel. Then 4.4 ml (31.5 mmol) triethylamine are added dropwise to this suspension (the suspension goes into solution), followed by the dropwise addition of 0.96 ml (10.5 mmol) of phosphoroxy chloride (exothermic reaction: Ti 60° C.). The suspension so obtained is heated for 1 hour to 80° C. After cooling to RT, 10 ml of water are added (the salts dissolve). The organic phase is separated, washed with water, dried over Na₂ SO₄ and concentrated on a vacuum rotary evaporator. Crystallisation of the residue (c. 10 g) in 20 ml of acetonitrile yields 6.8 g (73%) of compound 204 as a white powder. The melting point is 114°-115° C.

EXAMPLE 13

Preparation of compound 204 (process B).

12.18 g (0.05 mol) of 3-octyloxypropionic acid (83% GC), 4.7 ml (0.065 mol) of thionyl chloride and 0.11 g (0.5 mmol) of benzyltriethylammonium chloride are charged to a 50 ml round bottomed flask fitted with magnetic stirrer and condenser. The colourless solution is stirred for 10 minutes at RT (evolution of HCl+SO₂ ; endothermic reaction: Ti 12° C.). The reaction mixture is then heated to 65° C. under a weak stream of N₂ and further stirred for 45 minutes at this temperature. Excess thionyl chloride is removed by distillation (70°-80° C./40 mbar; 30 minutes). To the resultant colourless liquid (crude acid chloride) are added 18 g (0.041 mol) of 2,2'-ethylenebis[4,6-di-tert-butylphenol]. The mixture is heated to 140° C. (evolution of HCl) and stirred for 30 minutes at this temperature. Stirring is then continued under a weak stream of N₂ for 1 hour. The resultant brown liquid is cooled to c. 100° C. and 70 ml of ethanol are added. The batch is cooled in an ice bath, whereupon the product crystallises out. The crystalline product is isolated by filtration and dried under a high vacuum, affording 20 g (78%) of compound 204 as a white powder. The melting point is 115° C.

EXAMPLE 14

Preparation of compound 215 (process B).

a) Preparation of 3-(2-butoxyethoxy)propionic acid

2 ml (3.2 mmol, 10 mol %) of a 1.6N solution of butyllithium in hexane are added dropwise, under N₂, at 10° C. to a solution of 3.8 g (32 mmol) of 2-butoxyethanol in 2 ml of tetrahydrofuran. The solution is stirred for 5 minutes at 10° C. Then 2.5 ml (38 mmol) of acrylonitrile are added. The reaction mixture is heated to 55° C. and stirred for 2.5 hours at this temperature. Then a further 0.25 ml (3.8 mmol) of acrylonitrile is added and the mixture is stirred for another hour at 55° C. The reaction mixture is cooled to RT and afterwards poured into water. After acidification with 2N HCl (2 ml) and extraction with toluene, the organic phase is washed with an aqueous saturated solution of NaCl, dried over magnesium sulfate and concentrated on a vacuum rotary evaporator. The crude 3-(2-buthoxyethoxy)propionitrile (4.4 g) is taken up in 15 ml of concentrated hydrochloric acid and the solution is heated for 2.5 hours to 80° C. The resultant brown solution is cooled to RT, diluted with water and and extracted once more with ethyl acetate. The organic phases are combined, washed with an aqueous saturated solution of NaCl, dried over MgSO₄, concentrated on a vacuum rotary evaporator and dried under a high vacuum, affording 3.2 g (53%) of 3-(2-butoxyethoxy)propionic acid as a pale brown liquid.

¹ H-NMR (300 MHz; CDCl₃): δ (ppm) 0.91 (t, J=7.3 Hz, 3H); 1,36 (sextet, J=7.6 Hz, 2H); 1.57 (quintet, J=7.8 Hz, 2H); 2.65 (t, J=6.3 Hz, 2H); 3.47 (t, J=6.6 Hz, 2H); 3.56-3.65 (dxm, 4H); 3.77 (t, J=6.3 Hz, 2H); 9.6 (s, wide, 1H).

b) A solution of 3.1 g (15 mmol) of dicyclohexylcarbodiimide in 10 ml of ethylene chloride is added dropwise at RT under N₂ to a solution of 6.6 g (15 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol], 3.76 g (18 mmol) of 3-(2-butoxyethoxy)propionic acid and 0.1 g (0.8 mmol, 5 mol %) of dimethylaminopyridine in 60 ml of ethylene chloride. The reaction mixture is stirred for 15 hours at RT. The precipitated urea is removed by filtration and the solvent is removed by evaporation. Crystallisation of the residue from acetonitrile yields 5 g (54%) of compound 215 as a white powder. The melting point is 88°-91° C.

EXAMPLE 15

Preparation of compound 216 (process B).

a) 10.02 g (55 mmol) of 3-[3-(2-carboxyethoxy)propoxy]propanoic acid (q.v. R.V. Christian and R.M. Hixon J.A.C.S. 70, 1333, (1948)) in 100 ml of toluene are charged to a 250 ml round botomed flask under nitrogen. To this suspension are added 13.2 ml (180 mmol) of thionyl chloride and the mixture is slowly heated (over 40 minutes) to 90° C. (evolution of HCl+SO₂) and stirred for 1 hour at this temperature. Stirring is then continued for another 45 minutes at 90° C. while introducing a stream of argon. Distillation of excess thionyl chloride and toluene yields the crude bis-acid chloride, which is further used direct.

b) The bis-acid chloride described in Example 15a (55 mmol) and 43.87 g (0.1 mol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol] in 100 ml of toluene are charged to a 350 ml sulfonation flask under argon. This solution is cooled to 10° C. and 16.7 ml (120 mmol) of triethylamine are slowly added dropwise. When this addition is complete (c. 50 minutes), the mixture is heated to 70° C. and further stirred overnight at this temperature.

The precipitated triethylamine hydrochoride is removed by filtration and the filtrate is concentrated by evaporation. Chromatography of the residue over silica gel (eluant: Hex/EE 40:1 ) yields 21 g (40% ) of compound 216 as an amorphous powder. The melting point is 94° C.

Compounds 217 and 218 are prepared in general accordance with the method described in this Example.

EXAMPLE 16

Preparation of compound 219 (Process B).

a) Preparation of 3-(2,4-di-tert-butylphenoxy)propionic acid

6.2 ml (94 mmol) of acrylonitrile are added dropwise at room temperature under N₂ over 20 minutes to a solution of 9.7 g (47 mmol) of 2,4-di-tert-butylphenol and 0.6 ml (1.5 mmol) of benzyltrimethylammonium hydroxide (40% solution in water). When this addition is complete, the reaction mixture is heated to 65° C. and stirred for 2.5 hours at this temperature. Excess acrylonitrile is subsequently removed by distillation (vacuum rotatary evaporator). The crude 3-(2,4-di-tert-butylphenoxy)propionitrile is dissolved in 40 ml of conc. hydrochloric acid and 40 ml of acetic acid and the solution is heated for 10 hours to 100° C. The mixture is cooled, poured into 60 ml of water and extracted with a 1:1 mixture of hexane/ethyl acetate. The organic phase is separated, washed with an aqueous saturated solution of NaCl, dried over sodium sulfate and concentrated on a vacuum rotary evaporator. Distillation of the residue (60° C./0.1 mbar) yields 10 g (77%) of the desired acid as a whiteish-beige powder. The melting point is 105°-106° C.

¹ H-NMR (300 MHz) CDCl₃ : δ=2,89 (t, J=6.2 Hz, 20H; --CH₂ --COOH--), 4.27 (t,J=6.2 Hz, 2H, A--O--CH₂ --).

b) 10 g (36 mmol) of 3-(2,4-di-tert-butylphenoxy)propionic acid, 13.1 g (30 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol], 0.2 g (1.6 mmol, 5 mol %) of dimethylaminopyridine and 180 ml of dichloroethane are charged to a round bottomed flask fitted with condenser and magnetic stirrer. Then a solution of 6.2 g (30 mmol) of dicyclohexylcarbodiimide in 20 ml of dichloroethane are added dropwise to this solution at RT and under N₂. The mixture is stirred for 15 hours at RT. The precipitated urea is removed by filtration and the solvent is stripped off. Crystallisation of the residue from hexane yields 10 g (48%) of compound 219 as a white powder. The melting point is 185° C.

Compound 220 is prepared from commercially available 3-phenoxypropionic acid and 2,2'-ethylidenebis[4,6-di-tert-butylphenol] in analogy to the process described in Example 16b.

EXAMPLE 17

Preparation of compound 221 (process B).

a) Preparation of 3-cyclohexylideneaminoxypropionic acid

A mixture of 32.8 g (0.29 mol) of cyclohexanone oxime, 26 g (0.26 mmol) of ethyl acrylate, 26 ml (0.052 mol) of a 2N solution of KOH in ethanol and 150 ml of ethanol is stirred for 96 hours at 60° C. and afterwards concentrated on a vacuum rotary evaporator. The residue (an orange oil) is dissolved in 175 g (0.31 tool) of a 10% solution of KOH in ethanol and the solution is heated for 1 hour to 60° C. The solvent is distilled off and the solid residue is taken up in water. After acidification with c. 15 ml of conc. hydrochloric acid and extraction with ethyl acetate, the organic phase is washed with water, dried over Na₂ SO₄ and concentrated on a vacuum rotary evaporator. Distillation of the residue yields 11.8 g (25%) of the desired acid as an orange liquid. The boiling point is 135° C./0.05 mbar.

    ______________________________________                                         Elemental analysis:                                                            ______________________________________                                         C %          calcd: 58.36 found: 58.47                                         H %          calcd: 8.16  found: 8.30                                          N %          calcd: 7.56  found: 7.13                                          ______________________________________                                    

b) Starting from 8.03 g (39 mmol) of 3-cyclohexylideneaminooxypropionic acid and 15.34 g (35 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol] and carrying out the procedure as described in Example 16b there are obtained 15.3 g (72%) of compound 221 as a white powder. The melting point is 118°-121° C. (methanol).

Compounds 222-224 are prepared in analogy to the method described in Example 13 (process B).

Compound 225 is prepared in analogy to the method described in Example 14b (process B).

EXAMPLE 18

Preparation of compound 301 (oxidation of the thioether obtained in process A)

a) Preparation of 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylphenylmethyl)-4-methylphenyl 3-(octylthio)propanoate

In a 200 ml sulfonation flask, 9.86 g (25 mmol) of 2,2'-methylenebis[6-tert-butyl-4-methylphenol]monoacrylate and 4.02 g (27.5 mmol) of octanethiol are dissolved in 50 ml of toluene. Then 0.75 ml (1.25 mmol) of a 1.7N solution of potassium tert-pentylate in toluene is added dropwise at RT. Afterwards the reaction mixture is heated to c. 55° C. and stirred for 1 hour at this temperature. The mixture is cooled to RT and poured into dilute hydrochloric acid (0.1N). After repeated extraction with ethyl acetate the organic phases are combined, dried over sodium sulfate and concentrated on a vacuum rotary evaporator. Unreacted bisphenol is removed (bulb tube distillation at 200° C./10 mbar), giving 11.35 g (84%) of the desired compound as a pale yellow oil.

    ______________________________________                                         Elemental analysis:                                                            ______________________________________                                         C %   calcd: 75.51                                                                              H %     calcd: 9.69                                                                            S %   calcd: 5.93                                   found: 75.31       found: 9.84   found: 6.05                             ______________________________________                                    

b) In a 250 ml sulfonation flask, 10.82 g (20 mmol) of the compound of Example 18a are dissolved, under nitrogen, in 130 ml of dichloromethane. Then a solution of 6.59 g (21 mmol) of m-chloroperbenzoic acid in 70 ml of dichloromethane are added dropwise to this solution at -15° C. The reaction mixture is stirred for 30 minutes at -15° C. and poured into an aqueous saturated solution of sodium hydrogencarbonate. After repeated extraction with dichloromethane, the organic phases are combined, washed with water, dried over sodium sulfate and concentrated on a vacuum rotary evaporator. The residue is dried under a high vacuum, affording 11.13 g (100%) of compound 301 as a colourless highly viscous oil.

EXAMPLE 19

Preparation of compound 302 (oxidation of the thioether obtained in process A)

In a 250 ml sulfonation flask, 10.82 g (20 mmol) of the compound of Example 18 are dissolved, under nitrogen, in 80 ml of dichloromethane.

A solution of 13.82 g (42 mmol) of m-chloroperbenzoic acid in 120 ml of dichloromethane is added dropwise to this solution at -15° C. The thick suspension is further stirred until it has warmed to RT and then poured into an aqueous saturated solution of sodium hydrogencarbonate. After repeated extraction with dichloromethane, the organic phases are combined, washed with water, dried over sodium sulfate and concentrated on a vacuum rotary evaporator. Crystallisation of the residue from isopropanol yields 8.05 g (70%) of compound 302 as a pale beige powder. The melting point is 108°-113° C.

EXAMPLE 20

Preparation of compound 401 (process A).

A mixture of 12.3 g (0.025 mol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate, 2.07 g (0.03 mol) of 1,2,4-triazole and a few drops of pyridine is stirred for 3 hours at 150° C. The reaction mixture is then cooled to c. 100° C. and, after addition of c. 30 ml of isopropanol, filtered hot. Upon cooling to room temperature, compound 401 crystallises out. The crystalline product is collected by suction filtration and dried, affording 9.10 g (65%) of compound 401 as a white powder. The melting point is 160°-162° C.

Compound 402 is prepared in analogy to the method described in Example 20, except that the reaction is carried out at 170° C. instead of 150° C.

EXAMPLE 21

Preparation of compound 403 (process B).

0.68 ml (1.15 g; 7.5 mmol) of phosphoryl chloride is added dropwise at 50° C. under N₂ to a colourless solution of 4.39 g (10 mmol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol], 2.5 g (13 mmol) of 3-benzotriazol-1-yl-propionic acid (Wiley et al; J. A. C. S. 76, 4933 (1954)) and 2.02 g (20 mmol) of triethylamine in 40 ml of tetrahydrofuran. The resultant suspension is stirred for 5 hours under reflux. The reaction mixture is cooled to room temperature, filtered to remove the salts and concentrated on a vacuum rotary evaporator. The residue is poured into water and, after two extractions with ethyl acetate, the organic phases are combined, washed with an aqueous saturated solution of NaCl, dried over sodium sulfate and concentrated on a vacuum rotary evaporator.

Crystallisation of the residue from ethanol yields 3.9 g (80%) of compound 403 as a white powder. The melting point is 174°-178° C.

EXAMPLE 22

Preparation of compound 404 (process A).

A mixture of 14.78 g (0.03 mol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate, 5.02 g (0.03 tool) of 2-mercaptobenzothiazole and a few drops of pyridine in 25 ml of dichloroethane is stirred under reflux for 15 hours. The reaction mixture is concentrated on a vacuum rotary evaporator. Purification by chromatography (SiO₂ ; hexane/ethyl acetate: 40:1) and crystallisation from acetonitrile give 7.65 g (39%) of compound 404 as a white powder. The melting point is 123°-128° C.

EXAMPLE 22a

Preparation of compound 405.

A solution of 14.78 g (0.03 mol) of 2,2'-ethylidenebis[4,6-di-tert-butylphenol]monoacrylate, 5.02 g of 2-mercaptobenzothiazole and a few drops of pyridine in 25 ml of dichloroethane is stirred under reflux at 90° C. for 15 hours. The reaction mixture is concentrated on a vacuum rotary evaporator. Purification by chromatography (SiO₂ ; hexane/ethyl acetate: 40:1) gives 7.7 g (39%) of compound 405 as an amorphous powder. The melting point is 123°-128° C. after crystallisation in acetonitrile.

EXAMPLE 23

Stabilisation of multiple-extruded polypropylene

1.3 kg of polypropylene powder (Profax 6501), which has been prestabilised with 0.025% of n-octadecyl 3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionate (melt index 3.2 g/10 min, measured at 230° C./2.16 kg) are blended with 0.05% of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 0.05% of calcium stearate, 0.03% of dihydrotalcite ([Mg₄.5 Al₂ (OH)₁₃ CO₃.3,5H₂ O]) and 0.05% of a compound of Table 1. This blend is then extruded in an extruder having a cylinder diameter of 20 mm and a length of 400 mm at 100 rpm, the 3 heating zones being adjusted to the following temperatures: 260°, 270°, 280° C. The extrudate is cooled by drawing it through a water bath and is then granulated. This granulate is repeatedly extruded. After 3 extrusions, the melt index is measured (at 230° C./2.16 kg). A substantial increase in the melt index denotes pronounced chain degradation, i.e. poor stabilisation. The results are shown in Table 2.

                  TABLE 2                                                          ______________________________________                                         Compound of   Melt index                                                       Table 1       after 3 extrusions                                               ______________________________________                                         --            20.0                                                             101           7.7                                                              106           8.0                                                              107           7.5                                                              108           7.5                                                              109           6.2                                                              110           6.2                                                              301           7.4                                                              ______________________________________                                    

EXAMPLE 24

Stabilisation of elastomers (Brabender test)

A styrene-butadiene-styrene elastomer (®Finaprene 902) is blended with the stabiliser indicated in Table 3 and the blend is kneaded in a Brabender plastograph at 200° C. and 60 rpm. The kneading resistance is recorded continuously as torque. After initially remaining constant, the torque increases rapidly in the course of the kneading time owing to the crosslinking of the polymer. A prolongation of the time the torque remains constant is a measure of the effectiveness of the stabilisers. The values obtained are reported in Table 3.

                  TABLE 3                                                          ______________________________________                                         0.25% of stabiliser                                                                           Time in minutes                                                 of Table 1     until increase in torque                                        ______________________________________                                         --             24.2                                                            113            63.3                                                            114            60.0                                                            115            53.5                                                            116            56.6                                                            118            68.4                                                            119            54.0                                                            ______________________________________                                    

EXAMPLE 25

Stabilisation of styrene-butadiene block polymers.

Thermal oxidative damage of styrene-butadiene block polymers results in a crosslinking of the rubber phase. In the course of processing in an extruder or in an injection moulding machine, this crosslinking results in an increase in the melt viscosity and therefore in the extrusion pressure.

The test of the processing stability of styrene-butadiene block polymers is often carried out in a capillary rheometer. In this test, the polymer--as similarly in extrusion--is forced through a nozzle as melt.

25 g of a styrene-butadiene block polymer granulate (®K-Resin KR-01, ex ®Phillips Petroleum ) containing 0.2% of n-octadecyl-3-[3',5'-di-tert-butyl-4'-hydroxyphenyl]propionate and 0.6% of tris[nonylphenyl]phosphite are dissolved in 250 ml of cyclohexane at room temperature.

The amount of stabiliser shown in Table 4 is dissolved in toluene and added to the polymer solution. The cyclohexane is stripped off at 60° C./0.013 bar.

The resultant polymer is compression moulded at 180° C. to 2 mm sheets from which circular specimens 8 mm in diameter are punched out. These specimens are placed in the receiver channel of a ®Keyeness Galaxy V capillary rheometer and measured at 250° C. and at a shear rate of 14,594 sec⁻¹. After 6 minutes the apparent shear rate is recorded over 30 minutes as a function of the time. The slope of this curve (Δη/Δt in [Pa sec/min]) is a measure of the degree of crosslinking of the polymer and is therefore directly linked to the action of the stabiliser. The smaller this value is, the more effective the stabiliser. The results are shown in Table 4.

                  TABLE 4                                                          ______________________________________                                          ##STR81##                                                                                      ##STR82##                                                     ______________________________________                                         --                  23                                                         113                 2                                                          114                 8                                                          116                 5                                                          117                 5                                                          214         bis     6                                                          215                 2                                                          216                 6                                                          ______________________________________                                     

What is claimed is:
 1. A compound of formula I ##STR83## wherein the substituents R₁ are each independently of one another C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁,the substituents R₂ are each independently of one another hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃, the substituents R₃ are each independently of one another hydrogen or C₁ -C₄ alkyl, R₄ is hydrogen or C₁ -C₈ alkyl, R₅ is hydrogen, C₁ -C₁₀ alkyl, phenyl, --CH₂ --COO--X₄ or CN, R₆ is hydrogen, C₁ -C₄ alkyl, phenyl, --COO--X₅, --CN or --CON(X₆)(X₇), R₇ is hydrogen or C₁ -C₁₀ alkyl, R₈ is hydrogen, C₁ -C₄ alkyl or phenyl, X₁ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁, X₂, X₄ and X₅ are each independently of one another C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, X₃ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₂₅ alkanoyl, C₃ -C₂₅ alkenoyl, a C₃ -C₂₅ alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl or furoyl, X₆ and X₇ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, Y₁ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, Y₂ is hydrogen or C₁ -C₈ alkyl, p is 0, 1 or 2, q is an integer from 0 to 8, r is 1 or 2, n is an integer from 1 to 4, and, when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom, Z₁ is hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₅ alkyl which is interrupted by oxygen, sulfur or >N--Y₂, C₃ -C₂₄ alkenyl, a monocyclic saturated hydrocarbon radical containing 5 to 20 carbon atoms, a bicyclic saturated hydrocarbon radical containing 7 to 20 carbon atoms, a tricyclic saturated hydrocarbon radical containing 10 to 20 carbon atoms, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ C₁₂ cycloalkenyl, C₇ -C₉ phenylalkyl, C₇ -C₉ phenylalkyl which is substituted at the phenyl ring by C₁ C₄ alkyl; tetrahydrofurfuryl, tetrahydroabietyl, C₁ -C₂₅ alkanoyl, C₃ -C₂₅ alkenoyl, C₃ -C₂₅ alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl or a group of formula IIa or IIb, ##STR84## Z₂ is hydrogen, C₁ -C₂₅ alkyl, OH-substituted C₂ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₂₅ alkanoyl, C₃ -C₂₅ alkenoyl, C₃ -C₂₅ alkanoyl which is interrupted by oxygen, sulfur or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb, Z₃ is hydrogen, C₁ -C₂₅ alkyl, OH-substituted C₂ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, or Z₂ and Z₃, taken together, are C₃ -C₆ alkylene, C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen, sulfur or >N--T₆, Z₄ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, Z₅ and Z₆ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, or Z₅ and Z₆, together with the linking carbon atom, form an unsubstituted or a C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkylidene ring, Z₇ is C₁ -C₂₅ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁, Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl, T₁ and T₂ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁, T₃ is hydrogen or C₁ -C₄ alkyl, T₄ is hydrogen, C₁ -C₂₅ alkyl, C₂ -C₂₄ alkenyl, C₅ -₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, C₅ -C₁₂ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃, T₅ is hydrogen, C₁ -C₈ alkyl, --OH-substituted C₂ -C₄ alkyl, O, --OH, --NO, --CH₂ CN, C₁ -C₁₈ alkoxy, C₅ -C₁₂ cycloalkoxy, C₃ -C₆ alkenyl, C₇ -C₉ phenylalkyl, C₇ -C₉ phenylalkyl which is substituted at the phenyl ring by C₁ -C₄ alkyl; C₁ -C₈ alkanoyl, C₃ -C₈ alkenoyl or benzoyl, T₆ is C₁ -C₁₂ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, m is 1 or 2, w is 0 or 1, when n is 2, A is a group of formula IIIa, IIIb, IIIc, IIId, IIIe or IIIf, ##STR85## G₁ and G₃ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb, G₂ is C₂ -C₁₂ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene, naphthylene, C₂ -C₂₀ alkanedioyl, C₄ -C₂₀ alkenedioyl or carboxybenzoyl, G₄ and G₆ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, G₅ is C₂ -C₁₂ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene )-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, G₇ is C₂ -C₂₀ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkynylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, C₂ -C₂₀ alkanedioyl, C₄ -C₂₀ alkenedioyl, carboxybenzoyl or a group of formula IVa, IVb or IVc ##STR86## G₈ and G₁₀ are each independently of the other hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, G₉ and G₁₁ are C₂ -C₁₂ alkylene, C₄ -C₂₀ alkylene which is interrupted by oxygen, sulfur or >N--Y₂, C₄ -C₂₀ alkenylene, C₄ -C₂₀ alkylene, (C₁ -C₄ alkylene)-phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical with two free valences and containing 5 to 12 carbon atoms, a bicyclic saturated hydrocarbon radical with two free valences and containing 7 to 30 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, G₁₂ is hydrogen, C₁ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, the substituents D₁ are each independently of the other hydrogen, C₁ -C₈ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, the substituents D₂ are each independently of the other hydrogen, C₁ -C₈ alkyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, D₃ and D₄ are each independently of the other hydrogen, CF₃, C₁ -C₁₂ alkyl or phenyl, or D₃ and D₄, together with the linking carbon atom, form an unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkylidene ring, t is 1 or 2, v is 0 or 1, when n is 3, A is a group of formula Va, Vb or Vc, ##STR87## E₁ is C₃ -C₇ alkanetriyl, E₂ and E₃ are C₂ -C₈ alkylene, when n is 4, A is a group of formula VI ##STR88## and E₄ is C₄ -C₁₀ alkanetetrayl or C₄ -C₁₀ alkanetetrayl which is interrupted by oxygen.
 2. A compound according to claim 1, whereinthe substituents R₁ are each independently of one another C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁, the substituents R₂ are each independently of one another hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃, the substituents R₃ are each independently of one another hydrogen or C₁ -C₄ alkyl, R₄ is hydrogen or C₁ -C₈ alkyl, R₅ is hydrogen, C₁ -C₁₀ alkyl or phenyl, R₆ is hydrogen, C₁ -C₄ alkyl or phenyl, R₇ is hydrogen or C₁ -C₁₀ alkyl, R₈ is hydrogen, C₁ -C₄ alkyl or phenyl, X₁ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁, X₂ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, X₃ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₈ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl or furoyl, Y₁ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, Y₂ is hydrogen or C₁ -C₈ alkyl, p is 0, 1 or 2, q is an integer from 0 to 8, r is 1 or 2, n is an integer from 1 to 4, and, when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom, Z₁ is hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkyl which is interrupted by oxygen or >N--Y₂, C₃ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, C₇ -C₉ phenylalkyl, C₇ -C₉ phenylalkyl which is substituted at the phenyl ring by C₁ -C₄ alkyl; tetrahydrofurfuryl, tetrahydroabietyl, C₁ -C₁₈ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen or >N--Y₂, C₆ -C₉ -cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl or a group of formula IIa or IIb, Z₂ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₈ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen or >N--Y₂, C₆ -C₉ cycloalkylcarbonyl, benzoyl, C₁ -C₄ alkyl-substituted benzoyl, thenoyl, furoyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb, Z₃ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, or Z₂ and Z₃, taken together, are C₃ -C₆ alkylene, C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen or >N--T₆, Z₄ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted penyl or C₇ -C₉ phenylalkyl, Z₅ and Z₆ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, or Z₅ and Z₆, together with the linking carbon atom, form an unsubstituted or C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkylidene ring, Z₇ is C₁ -C₁₈ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁, Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl, T₁ and T₂ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁, T₃ is hydrogen or C₁ -C₄ alkyl, T₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkenyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃, T₅ is hydrogen, C₁ -C₄ alkyl, --OH, C₆ -C₁₂ alkoxy, C₅ -C₈ cycloalkoxy, allyl, benzyl or acetyl, T₆ is C₁ -C₁₂ alkyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl or C₇ -C₉ phenylalkyl, m is 1 or 2, w is 0 or 1, when n is 2, A is a group of formula IIIa, IIIb, IIIc, IIId, IIIe or IIIf, G₁ and G₃ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb, G₂ is C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, C₂ -C₁₈ alkanedioyl, C₄ -C₁₈ alkenedioyl or carboxybenzoyl, G₄ and G₆ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, G₅ C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, G₇ is C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, C₂ -C₁₈ alkanedioyl, C₄ -C₁₈ alkenedioyl or carboxybenzoyl G₈ and G₁₀ are each independently of the other hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, G₉ and G₁₁ are C₂ -C₁₂ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen or >N--Y₂, C₄ -C₁₂ alkenylene, C₄ -C₁₂ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 12 carbon atoms, phenylene, C₁ -C₄ alkyl-substituted phenylene or naphthylene, G₁₂ is hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₈ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, and t is 1 or
 2. 3. A compound according to claim 1, whereinthe substituents R₁ are each independently of one another C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₅ -C₈ -cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁, the substituents R₂ are each independently of one another hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃, the substituents R₃ are hydrogen, R₄ is hydrogen or C₁ -C₄ alkyl, R₅ is hydrogen, C₁ -C₄ alkyl or phenyl, R₆ is hydrogen, C₁ -C₄ alkyl or phenyl, R₇ is hydrogen or C₁ -C₄ alkyl, R₈ is hydrogen, C₁ -C₄ alkyl or phenyl, X₁ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁, X₂ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl or C₇ -C₉ phenylalkyl, X₃ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₀ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen; or benzoyl, Y₁ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl or C₇ -C₉ phenylalkyl, p is 0, 1 or 2, q is an integer from 0 to 8, r is 1 or 2, n is an integer from 1 to 4, and, when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom, Z₁ is hydrogen, C₁ -C₁₈ alkyl, C₃ -C₁₈ alkyl which is interrupted by oxygen; C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, C₇ -C₉ phenylalkyl, tetrahydrofurfuryl, C₁ -C₁₀ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen; benzoyl or a group of formula IIa or IIb, Z₂ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl, C₁ -C₁₀ alkanoyl, C₃ -C₁₈ alkenoyl, C₃ -C₁₈ alkanoyl which is interrupted by oxygen; benzoyl, --(CH₂)_(p) COO--X₂ or a group of formula IIb, Z₃ is hydrogen, C₁ -C₁₈ alkyl, OH-substituted C₂ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, or Z₂ and Z₃, taken together, are C₃ -C₆ alkylene, C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen, Z₄ is C₁ -C₁₀ alkyl, C₅ -C₈ -cycloalkyl, phenyl or C₇ -C₉ phenylalkyl, Z₅ and Z₆ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ cycloalkenyl, phenyl or C₇ -C₉ phenylalkyl, or Z₅ and Z₆, together with the linking carbon atom, form a C₅ -C₈ cycloalkylidene ring, Z₇ is C₁ -C₁₀ alkyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or --(CH₂)_(r) COO--Y₁, Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl, T₁ and T₂ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ -cycloalkyl, C₅ -C₈ cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl or --CH₂ --S--X₁, T₃ is hydrogen or C₁ -C₄ alkyl, T₄ is hydrogen, C₁ -C₁₀ alkyl, C₂ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, C₅ -C₈ -cycloalkenyl, phenyl, C₇ -C₉ phenylalkyl, --CH₂ --S--X₁, --(CH₂)_(p) COO--X₂ or --(CH₂)_(q) O--X₃, T₅ is hydrogen, C₁ -C₄ alkyl, --OH, C₆ -C₁₂ alkoxy, C₅ -C₈ cycloalkoxy, allyl, benzyl or acetyl, m is 1 or 2, w is 0 or 1, when n is 2, A is a group of formula IIIa, IIIb, IIIc, IIId, IIIe or IIIf, G₁ and G₃ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb, G₂ is C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms, phenylene, C₂ -C₁₀ alkanedioyl, C₄ -C₁₀ alkenedioyl or carboxybenzoyl, G₄ and G₆ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, G₅ is C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene )phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms or phenylene, G₇ is C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms, phenylene, C₂ -C₁₀ alkanedioyl, C₄ -C₁₀ alkenedioyl or carboxybenzoyl, G₈ and G₁₀ are each independently of the other hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, G₉ and G₁₁ are C₂ -C₁₀ alkylene, C₄ -C₁₂ alkylene which is interrupted by oxygen; C₄ -C₁₀ alkenylene, C₄ -C₁₀ alkynylene, (C₁ -C₄ alkylene)phenylene-(C₁ -C₄ alkylene), a monocyclic saturated hydrocarbon radical having two free valences and containing 5 to 10 carbon atoms or phenylene, G₁₂ is hydrogen, C₁ -C₁₀ alkyl, C₃ -C₁₈ alkenyl, C₅ -C₈ cycloalkyl, phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb, and t is 1 or
 2. 4. A compound according to claim 1, wherein R₅, R₆, R₇ and R₈ are hydrogen.
 5. A compound according to claim 1, wherein n is 1 or
 2. 6. A compound according to claim 1, wherein n is 1,A is a group of formula --N(Z₂)(Z₃), Z₂ is hydrogen, and Z₃ is hydrogen, C₁ -C₂₅ alkyl, OH-substituted C₂ -C₂₅ alkyl, C₃ -C₂₄ alkenyl, C₅ -C₁₂ cycloalkyl, C₁ -C₄ alkyl-substituted C₅ -C₁₂ cycloalkyl, phenyl, C₁ -C₄ alkyl-substituted phenyl, C₇ -C₉ phenylalkyl or a group of formula IIb.
 7. A compound according to claim 1, whereinn is 1, A is a group of formula --O--Z₁, and Z₁ is C₁ -C₂₅ alkyl which is interrupted by oxygen; or a group of formula IIa, and w is
 1. 8. A compound according to claim 1, whereinthe substituents R₁ are identical and are C₁ -C₅ alkyl or C₅ -C₈ cycloalkyl, the substituents R₂ are identical and are C₁ -C₅ alkyl, the substituents R₃ are hydrogen, and R₄ is hydrogen or C₁ -C₄ alkyl.
 9. A compound according to claim 1, whereinthe substituents R₁ are identical and are C₁ -C₅ alkyl or C₅ -C₈ cycloalkyl, the substituents R₂ are identical and are C₁ -C₅ alkyl, the substituents R₃ are hydrogen, R₄ is hydrogen or C₁ -C₄ alkyl, R₅, R₆, R₇ and R₈ are hydrogen, n is 1 or 2, and, when n is 1, A is a group --O--Z₁, --N(Z₂)(Z₃), --NH(OZ₄), --O--N═C(Z₅)(Z₆), --S(O)_(m) Z₇, --NH--Z₈ or --S--Z₈, or A is also an unsubstituted or C₁ -C₄ alkyl-substituted heterocyclic radical which has the free valence at a nitrogen atom, Z₁ is C₁ -C₁₈ alkyl, C₃ -C₁₀ alkyl which is interrupted by oxygen; C₅ -C₈ cycloalkyl, tetrahydrofurfuryl or a group of formula IIa or IIb, Z₂ is C₁ -C₁₈ alkyl, --OH-substituted C₂ -₄ alkyl, C₇ -C₉ phenylalkyl, --(CH₂)_(p) COO--X₂ or a radical of formula IIb, Z₃ is hydrogen, C₁ -C₁₈ alkyl, --OH-substituted C₂ -₄ alkyl, C₇ -C₉ phenylalkyl or a radical of formula IIb, or Z₂ and Z₃, taken together, are C₃ -C₆ oxoalkylene or C₃ -C₆ alkylene which is interrupted by oxygen, Z₄ is C₇ -C₉ phenylalkyl, Z₅ and Z₆, together with the linking carbon atom, form a C₅ -C₈ cycloalkylidene ring, Z₇ is C₁ -C₁₀ alkyl, Z₈ is unsubstituted or C₁ -C₄ alkyl-substituted 2-benzoxazolyl or unsubstituted or C₁ -C₄ alkyl-substituted 2-benzothiazolyl, T₁, T₂, T₃ and T₄ are each independently of the other hydrogen or C₁ -C₄ alkyl, T₅ is hydrogen or C₁ -C₄ alkyl, X₂ is C₁ -C₁₀ alkyl, m is 1 or 2, p is 1, w is 0 or 1, and when n is 2, A is a group of formula IIIa, IIIc or IIIf, G₁ and G₃ are each independently of the other hydrogen, C₇ -C₉ phenylalkyl or a radical of formula IIb, G₂ is C₂ -C₈ alkylene or a monocyclic saturated hydrocarbon radical with two free valences and containing 10 carbon atoms, G₇ is C₂ -C₈ alkylene or C₄ -C₁₂ alkylene which is interrupted by oxygen, and G₁₂ is C₇ -C₉ phenylalkyl or a group of formula IIb.
 10. A composition comprising an organic material susceptible to oxidative, thermal, or light-induced degradation, and at least one compound of formula I as claimed in claim
 1. 11. A composition according to claim 10, wherein the organic material is a synthetic polymer.
 12. A composition according to claim 10, wherein the organic material is a polyolefin.
 13. A composition according to claim 10, wherein the organic material is a solution-polymerised polybutadiene rubber.
 14. A composition according to claim 10, wherein the organic material is a solution-polymerised styrene-butadiene copolymer or styrene-butadiene block copolymer.
 15. A composition according to claim 10, wherein the organic material is an acrylonitrile-butadiene-styrene.
 16. A method for stabilising an organic material against oxidative, thermal or light-induced degradation, which comprises incorporating into said organic material at least one compound of the formula I according to claim
 1. 